{"id":150,"date":"2026-08-06T23:16:38","date_gmt":"2026-08-06T14:16:38","guid":{"rendered":"https:\/\/sgt.tailc1292c.ts.net\/wordpress\/?p=150"},"modified":"2026-08-19T17:03:00","modified_gmt":"2026-08-19T08:03:00","slug":"%e3%81%93%e3%82%8c%e3%81%88%e3%81%90%e3%81%84%e3%81%a3%e3%81%99%e3%81%ad-dsse%ef%bc%86forward-privacy%ef%bc%86verifiable%e3%82%92%e5%90%8c%e6%99%82%e3%81%ab%e5%ae%9f%e7%8f%be%e3%81%97%e3%81%9f","status":"publish","type":"post","link":"https:\/\/sgt.tailc1292c.ts.net\/wordpress\/2026\/08\/06\/%e3%81%93%e3%82%8c%e3%81%88%e3%81%90%e3%81%84%e3%81%a3%e3%81%99%e3%81%ad-dsse%ef%bc%86forward-privacy%ef%bc%86verifiable%e3%82%92%e5%90%8c%e6%99%82%e3%81%ab%e5%ae%9f%e7%8f%be%e3%81%97%e3%81%9f\/","title":{"rendered":"\u3053\u308c\u3048\u3050\u3044\u3063\u3059\u306d (DSSE\uff06Forward Privacy\uff06verifiable\u3092\u540c\u6642\u306b\u5b9f\u73fe\u3057\u305f\u7814\u7a76)"},"content":{"rendered":"<p>\n  \u672c\u8ad6\u6587\u306f\uff0c\u30af\u30e9\u30a6\u30c9\u4e0a\u306b\u6697\u53f7\u5316\u3057\u305f\u30c7\u30fc\u30bf\u3092\u4fdd\u5b58\u3057\u306a\u304c\u3089\u691c\u7d22\u3067\u304d\u308b<br \/>\n  Dynamic Searchable Symmetric Encryption\uff08DSSE\uff09\u306b\u5bfe\u3057\u3066\uff0c<br \/>\n  \u300c\u30af\u30e9\u30a6\u30c9\u304c\u8fd4\u3057\u305f\u691c\u7d22\u7d50\u679c\u306f\u672c\u5f53\u306b\u6b63\u3057\u3044\u306e\u304b\u300d\u3092\u691c\u8a3c\u3067\u304d\u308b\u4ed5\u7d44\u307f\u3092\u8ffd\u52a0\u3059\u308b\u7814\u7a76\u3067\u3042\u308b\uff0e\n<\/p>\n<p>\n  \u7279\u306b\uff0c\u65e2\u5b58\u306eDSSE\u304c\u62b1\u3048\u308b<br \/>\n  <strong>\u30af\u30e9\u30a6\u30c9\u306b\u3088\u308b\u691c\u7d22\u7d50\u679c\u306e\u6539\u3056\u3093<\/strong>\u3068\u3044\u3046\u554f\u984c\u306b\u5bfe\u3057\u3066\uff0c<br \/>\n  <strong>Forward Privacy<\/strong>\u3068<strong>Public Verifiability<\/strong>\u3092\u4e21\u7acb\u3059\u308b\u3053\u3068\u3092\u76ee\u7684\u3068\u3057\u3066\u3044\u308b\uff0e\n<\/p>\n<h2>\u8ad6\u6587\u5168\u4f53\u306e\u6838\u5fc3<\/h2>\n<p>\n  \u3053\u306e\u8ad6\u6587\u3092\u4e00\u8a00\u3067\u8868\u3059\u3068\uff0c\n<\/p>\n<blockquote><p>\n  \u300c\u691c\u7d22\u53ef\u80fd\u6697\u53f7\u3067\u691c\u7d22\u3067\u304d\u308b\u3060\u3051\u3067\u306f\u306a\u304f\uff0c<br \/>\n  \u30af\u30e9\u30a6\u30c9\u304c\u8fd4\u3057\u3066\u304d\u305f\u691c\u7d22\u7d50\u679c\u304c\u6b63\u3057\u3044\u3053\u3068\u307e\u3067\u7b2c\u4e09\u8005\u304c\u691c\u8a3c\u3067\u304d\u308b\u3088\u3046\u306b\u3059\u308b\u300d\n<\/p><\/blockquote>\n<p>\n  \u3068\u3044\u3046\u7814\u7a76\u3067\u3042\u308b\uff0e\n<\/p>\n<p>\n  \u901a\u5e38\u306eDSSE\u3067\u306f\uff0c\u30af\u30e9\u30a6\u30c9\u306f\u6697\u53f7\u5316\u3055\u308c\u305f\u691c\u7d22\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f7f\u3063\u3066\u691c\u7d22\u7d50\u679c\u3092\u8fd4\u3059\uff0e<br \/>\n  \u3057\u304b\u3057\uff0c\u30af\u30e9\u30a6\u30c9\u304c\u60aa\u610f\u3092\u6301\u3063\u3066\u3044\u308b\u5834\u5408\uff0c<br \/>\n  \u300c\u672c\u676510\u4ef6\u3042\u308b\u306e\u306b5\u4ef6\u3057\u304b\u8fd4\u3055\u306a\u3044\u300d<br \/>\n  \u300c\u5225\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u7d50\u679c\u3092\u8fd4\u3059\u300d<br \/>\n  \u300c\u7d50\u679c\u306e\u6587\u66f8ID\u3092\u6539\u3056\u3093\u3059\u308b\u300d<br \/>\n  \u3068\u3044\u3063\u305f\u653b\u6483\u304c\u53ef\u80fd\u306b\u306a\u308b\uff0e\n<\/p>\n<p>\n  \u672c\u8ad6\u6587\u3067\u306f\uff0c\u3053\u306e\u691c\u7d22\u7d50\u679c\u306e\u6b63\u3057\u3055\u3092\uff0c<br \/>\n  BLS\u7f72\u540d\uff0cHMAC\uff0cPRF\u306a\u3069\u3092\u5229\u7528\u3057\u3066\u691c\u8a3c\u53ef\u80fd\u306b\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u307e\u305f\uff0cDSSE\u3067\u306f\u30c7\u30fc\u30bf\u8ffd\u52a0\u6642\u306b\u904e\u53bb\u306e\u691c\u7d22\u7d50\u679c\u3068\u306e\u95a2\u4fc2\u304c\u6f0f\u308c\u308b\u554f\u984c\u304c\u3042\u308b\u305f\u3081\uff0c<br \/>\n  Forward Privacy\u3082\u7dad\u6301\u3059\u308b\uff0e\n<\/p>\n<hr>\n<h2>\u7b2c1\u7ae0 Introduction<\/h2>\n<h3>1.1 \u80cc\u666f<\/h3>\n<p>\n  \u30af\u30e9\u30a6\u30c9\u306b\u6a5f\u5bc6\u30c7\u30fc\u30bf\u3092\u4fdd\u5b58\u3059\u308b\u5834\u5408\uff0c<br \/>\n  \u30af\u30e9\u30a6\u30c9\u3092\u5b8c\u5168\u306b\u306f\u4fe1\u7528\u3067\u304d\u306a\u3044\u305f\u3081\uff0c\u30c7\u30fc\u30bf\u3092\u6697\u53f7\u5316\u3057\u3066\u4fdd\u5b58\u3057\u305f\u3044\uff0e\n<\/p>\n<p>\n  \u3057\u304b\u3057\uff0c\u30c7\u30fc\u30bf\u3092\u666e\u901a\u306b\u6697\u53f7\u5316\u3059\u308b\u3068\uff0c<br \/>\n  \u30af\u30e9\u30a6\u30c9\u5074\u3067\u306f\u30c7\u30fc\u30bf\u306e\u5185\u5bb9\u3092\u691c\u7d22\u3067\u304d\u306a\u304f\u306a\u308b\uff0e\n<\/p>\n<p>\n  \u305d\u3053\u3067Searchable Symmetric Encryption\uff08SSE\uff09\u3092\u5229\u7528\u3059\u308b\uff0e<br \/>\n  SSE\u3067\u306f\uff0c\u30c7\u30fc\u30bf\u3092\u6697\u53f7\u5316\u3057\u305f\u307e\u307e\uff0c<br \/>\n  \u30af\u30e9\u30a6\u30c9\u4e0a\u3067\u30ad\u30fc\u30ef\u30fc\u30c9\u691c\u7d22\u3092\u5b9f\u884c\u3067\u304d\u308b\uff0e\n<\/p>\n<p>\n  \u3055\u3089\u306b\uff0c\u30c7\u30fc\u30bf\u306e\u8ffd\u52a0\u30fb\u524a\u9664\u306a\u3069\u306e\u66f4\u65b0\u3092\u30b5\u30dd\u30fc\u30c8\u3057\u305f\u3082\u306e\u304c<br \/>\n  Dynamic SSE\uff08DSSE\uff09\u3067\u3042\u308b\uff0e\n<\/p>\n<h3>1.2 \u554f\u984c\u70b9<\/h3>\n<p>\n  \u65e2\u5b58\u306e\u591a\u304f\u306eDSSE\u3067\u306f\uff0c\u30af\u30e9\u30a6\u30c9\u306f<br \/>\n  <strong>honest-but-curious<\/strong>\uff0c<br \/>\n  \u3064\u307e\u308a\u300c\u30d7\u30ed\u30c8\u30b3\u30eb\u306b\u306f\u5f93\u3046\u304c\uff0c\u3067\u304d\u308b\u3060\u3051\u60c5\u5831\u3092\u76d7\u3082\u3046\u3068\u3059\u308b\u300d<br \/>\n  \u30b5\u30fc\u30d0\u3068\u3057\u3066\u60f3\u5b9a\u3055\u308c\u3066\u3044\u308b\uff0e\n<\/p>\n<p>\n  \u3057\u304b\u3057\uff0c\u30af\u30e9\u30a6\u30c9\u304c<strong>malicious<\/strong>\u3060\u3063\u305f\u5834\u5408\uff0c<br \/>\n  \u30d7\u30ed\u30c8\u30b3\u30eb\u305d\u306e\u3082\u306e\u3092\u7834\u3063\u3066\uff0c<br \/>\n  \u691c\u7d22\u7d50\u679c\u3092\u610f\u56f3\u7684\u306b\u6539\u3056\u3093\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\uff0e\n<\/p>\n<ul>\n<li>\u672c\u6765\u306e\u691c\u7d22\u7d50\u679c\u306e\u4e00\u90e8\u3060\u3051\u8fd4\u3059<\/li>\n<li>\u5225\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u7d50\u679c\u3092\u8fd4\u3059<\/li>\n<li>\u6587\u66f8ID\u3092\u66f8\u304d\u63db\u3048\u308b<\/li>\n<li>\u691c\u7d22\u7d50\u679c\u3092\u52dd\u624b\u306b\u524a\u9664\u3059\u308b<\/li>\n<\/ul>\n<p>\n  \u305d\u3053\u3067\uff0c<br \/>\n  \u300c\u6697\u53f7\u5316\u3055\u308c\u3066\u3044\u308b\u304b\u3089\u5185\u5bb9\u306f\u5b88\u3089\u308c\u3066\u3044\u308b\u300d<br \/>\n  \u3060\u3051\u3067\u306f\u4e0d\u5341\u5206\u3067\uff0c<br \/>\n  <strong>\u691c\u7d22\u7d50\u679c\u305d\u306e\u3082\u306e\u304c\u6b63\u3057\u3044\u3053\u3068\u3092\u691c\u8a3c\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b<\/strong><br \/>\n  \u3068\u8ad6\u3058\u308b\uff0e\n<\/p>\n<h3>1.3 \u672c\u8ad6\u6587\u306e\u8ca2\u732e<\/h3>\n<ol>\n<li>\u691c\u8a3c\u53ef\u80fdDSSE\u306e\u5f62\u5f0f\u7684\u306a\u5b9a\u7fa9\u3092\u4e0e\u3048\u308b\uff0e<\/li>\n<li>\u65e2\u5b58\u306eSSE\u3092\u691c\u8a3c\u53ef\u80fd\u306b\u3059\u308b\u6c4e\u7528\u7684\u306a\u65b9\u5f0f \u03a8s \u3092\u63d0\u6848\u3059\u308b\uff0e<\/li>\n<li>Forward Privacy\u3092\u6301\u3064DSSE\u3092\uff0cPublicly Verifiable\u306b\u3059\u308b\u6c4e\u7528\u7684\u306a\u65b9\u5f0f \u03a8f \u3092\u63d0\u6848\u3059\u308b\uff0e<\/li>\n<li>\u6240\u6709\u8005\u5074\u306b\u691c\u8a3c\u7528\u306e\u8ffd\u52a0\u30b9\u30c8\u30ec\u30fc\u30b8\u3092\u5fc5\u8981\u3068\u3057\u306a\u3044\uff0e<\/li>\n<li>\u6240\u6709\u8005\u5074\u306e\u8a08\u7b97\u91cf\u3092\u5c0f\u3055\u304f\u6291\u3048\u308b\uff0e<\/li>\n<li>\u30e9\u30f3\u30c0\u30e0\u30aa\u30e9\u30af\u30eb\u30e2\u30c7\u30eb\u3067\u9069\u5fdc\u7684\u5b89\u5168\u6027\u3092\u8a3c\u660e\u3059\u308b\uff0e<\/li>\n<\/ol>\n<hr>\n<h2>\u7b2c2\u7ae0 Related Works<\/h2>\n<p>\n  \u3053\u3053\u3067\u306f\uff0cSSE\uff0cDSSE\uff0cForward Private SSE\uff0cVerifiable SSE\u306a\u3069\uff0c<br \/>\n  \u305d\u308c\u307e\u3067\u306e\u7814\u7a76\u3092\u6574\u7406\u3057\u3066\u3044\u308b\uff0e\n<\/p>\n<h3>2.1 SSE\u304b\u3089DSSE\u3078<\/h3>\n<p>\n  SSE\u306b\u3088\u3063\u3066\u6697\u53f7\u5316\u30c7\u30fc\u30bf\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u691c\u7d22\u304c\u53ef\u80fd\u306b\u306a\u3063\u305f\uff0e<br \/>\n  \u305d\u306e\u5f8c\uff0c\u5b9f\u969b\u306e\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3067\u306f\u30c7\u30fc\u30bf\u304c\u8ffd\u52a0\u30fb\u524a\u9664\u3055\u308c\u308b\u305f\u3081\uff0c<br \/>\n  \u52d5\u7684\u306a\u66f4\u65b0\u3092\u6271\u3048\u308bDSSE\u304c\u7814\u7a76\u3055\u308c\u305f\uff0e\n<\/p>\n<h3>2.2 Forward Privacy<\/h3>\n<p>\n  DSSE\u3067\u306f\uff0c\u30c7\u30fc\u30bf\u8ffd\u52a0\u6642\u306b<br \/>\n  \u300c\u3053\u306e\u65b0\u3057\u3044\u6587\u66f8\u304c\uff0c\u904e\u53bb\u306b\u691c\u7d22\u3055\u308c\u305f\u3069\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u306b\u5bfe\u5fdc\u3059\u308b\u306e\u304b\u300d<br \/>\n  \u304c\u30af\u30e9\u30a6\u30c9\u306b\u5206\u304b\u3063\u3066\u3057\u307e\u3046\u554f\u984c\u304c\u3042\u308b\uff0e\n<\/p>\n<p>\n  \u3053\u308c\u3092\u9632\u3050\u6027\u8cea\u304c<strong>Forward Privacy<\/strong>\u3067\u3042\u308b\uff0e\n<\/p>\n<p>\n  \u672c\u8ad6\u6587\u3067\u306f\uff0c<br \/>\n  \u65b0\u3057\u304f\u30ad\u30fc\u30ef\u30fc\u30c9\u30fb\u6587\u66f8\u306e\u7d44\u3092\u8ffd\u52a0\u3057\u3066\u3082\uff0c<br \/>\n  \u305d\u308c\u304c\u904e\u53bb\u306e\u691c\u7d22\u7d50\u679c\u306b\u3069\u306e\u3088\u3046\u306b\u5bfe\u5fdc\u3059\u308b\u304b\u3092<br \/>\n  \u30af\u30e9\u30a6\u30c9\u304c\u77e5\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u3044\u6027\u8cea\u3068\u3057\u3066\u6271\u3063\u3066\u3044\u308b\uff0e\n<\/p>\n<h3>2.3 Verifiable SSE<\/h3>\n<p>\n  \u65e2\u5b58\u7814\u7a76\u306b\u306f\uff0c<br \/>\n  \u691c\u7d22\u7d50\u679c\u304c\u6b63\u3057\u3044\u3053\u3068\u3092\u691c\u8a3c\u3059\u308bVerifiable SSE\u304c\u5b58\u5728\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u3057\u304b\u3057\uff0c\n<\/p>\n<ul>\n<li>\u6240\u6709\u8005\u3060\u3051\u304c\u691c\u8a3c\u3067\u304d\u308bPrivate Verifiability<\/li>\n<li>\u7b2c\u4e09\u8005\u3082\u691c\u8a3c\u3067\u304d\u308bPublic Verifiability<\/li>\n<li>\u52d5\u7684\u66f4\u65b0<\/li>\n<li>Forward Privacy<\/li>\n<\/ul>\n<p>\n  \u3092\u3059\u3079\u3066\u540c\u6642\u306b\u6e80\u305f\u3059\u3053\u3068\u306f\u96e3\u3057\u3044\uff0e\n<\/p>\n<p>\n  \u7279\u306b\u672c\u8ad6\u6587\u306f\uff0c<br \/>\n  <strong>Forward Private DSSE + Public Verifiability<\/strong><br \/>\n  \u3092\u72d9\u3063\u3066\u3044\u308b\uff0e\n<\/p>\n<hr>\n<h2>\u7b2c3\u7ae0 Preliminaries<\/h2>\n<p>\n  \u3053\u306e\u7ae0\u306f\uff0c\u672c\u8ad6\u6587\u306e\u65b9\u5f0f\u3092\u7406\u89e3\u3059\u308b\u305f\u3081\u306b\u5fc5\u8981\u306a\u6697\u53f7\u6280\u8853\uff0c<br \/>\n  \u30b7\u30b9\u30c6\u30e0\u30e2\u30c7\u30eb\uff0c\u5b89\u5168\u6027\u306e\u5b9a\u7fa9\u3092\u8aac\u660e\u3059\u308b\u7ae0\u3067\u3042\u308b\uff0e\n<\/p>\n<h3>3.1 Cryptographic Tools<\/h3>\n<p>\n  \u4e3b\u306b\u4ee5\u4e0b\u306e\u6697\u53f7\u8981\u7d20\u3092\u5229\u7528\u3059\u308b\uff0e\n<\/p>\n<ul>\n<li>\u53cc\u7dda\u5f62\u5199\u50cf\uff08Bilinear Map\uff09<\/li>\n<li>\u53cc\u7dda\u5f62\u30cf\u30c3\u30b7\u30e5\uff08Bilinear Hash\uff09<\/li>\n<li>BLS\u7f72\u540d<\/li>\n<li>\u6697\u53f7\u5b66\u7684\u30cf\u30c3\u30b7\u30e5\u95a2\u6570<\/li>\n<li>PRNG \/ PRF<\/li>\n<li>HMAC<\/li>\n<\/ul>\n<p>\n  \u7279\u306bBLS\u7f72\u540d\u304c\uff0c<br \/>\n  \u300c\u691c\u7d22\u7d50\u679c\u306b\u5bfe\u5fdc\u3059\u308b\u7f72\u540d\u3092\u4f5c\u308a\uff0c<br \/>\n  \u305d\u306e\u7f72\u540d\u3092\u4f7f\u3063\u3066\u691c\u7d22\u7d50\u679c\u306e\u6b63\u3057\u3055\u3092\u7b2c\u4e09\u8005\u304c\u691c\u8a3c\u3059\u308b\u300d<br \/>\n  \u305f\u3081\u306b\u91cd\u8981\u306b\u306a\u308b\uff0e\n<\/p>\n<h3>3.2 System Model<\/h3>\n<p>\n  \u30b7\u30b9\u30c6\u30e0\u306b\u306f3\u8005\u304c\u5b58\u5728\u3059\u308b\uff0e\n<\/p>\n<ul>\n<li><strong>Owner<\/strong>\uff1a\u30c7\u30fc\u30bf\u6240\u6709\u8005\u304b\u3064\u691c\u7d22\u8005<\/li>\n<li><strong>Cloud<\/strong>\uff1a\u6697\u53f7\u5316\u30c7\u30fc\u30bf\u3068\u691c\u7d22\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4fdd\u5b58\u30fb\u691c\u7d22\u3059\u308b\u30b5\u30fc\u30d0<\/li>\n<li><strong>Auditor<\/strong>\uff1a\u30af\u30e9\u30a6\u30c9\u306e\u691c\u7d22\u7d50\u679c\u3092\u691c\u8a3c\u3059\u308b\u7b2c\u4e09\u8005<\/li>\n<\/ul>\n<p>\n  Cloud\u306f<strong>malicious<\/strong>\u3068\u4eee\u5b9a\u3059\u308b\uff0e<br \/>\n  \u3064\u307e\u308a\uff0c\u6b63\u3057\u3044\u691c\u7d22\u7d50\u679c\u3092\u8fd4\u3059\u3068\u306f\u9650\u3089\u306a\u3044\uff0e\n<\/p>\n<p>\n  \u4e00\u65b9\uff0cAuditor\u306fhonest-but-curious\u3067\u3042\u308a\uff0c<br \/>\n  Cloud\u3068\u306f\u5171\u8b00\u3057\u306a\u3044\u3068\u4eee\u5b9a\u3059\u308b\uff0e\n<\/p>\n<h3>3.3 Design Goals<\/h3>\n<p>\n  \u672c\u8ad6\u6587\u306e\u76ee\u6a19\u306f\u4e3b\u306b4\u3064\u3067\u3042\u308b\uff0e\n<\/p>\n<ol>\n<li><strong>Confidentiality<\/strong>\uff1a\u30af\u30e9\u30a6\u30c9\u306b\u5e73\u6587\u60c5\u5831\u3092\u6f0f\u3089\u3055\u306a\u3044\uff0e<\/li>\n<li><strong>Efficiency<\/strong>\uff1a\u8a08\u7b97\u80fd\u529b\u306e\u4f4e\u3044Owner\u306e\u8ca0\u62c5\u3092\u5c0f\u3055\u304f\u3059\u308b\uff0e<\/li>\n<li><strong>Scalability<\/strong>\uff1a\u5927\u91cf\u306e\u30c7\u30fc\u30bf\u3092\u30af\u30e9\u30a6\u30c9\u3078\u9810\u3051\u3089\u308c\u308b\uff0e<\/li>\n<li><strong>Forward Privacy<\/strong>\uff1a\u30c7\u30fc\u30bf\u8ffd\u52a0\u306b\u3088\u3063\u3066\u904e\u53bb\u306e\u691c\u7d22\u60c5\u5831\u3092\u6f0f\u3089\u3055\u306a\u3044\uff0e<\/li>\n<\/ol>\n<h3>3.4\uff5e3.5 VDSSE\u306e\u5b9a\u7fa9<\/h3>\n<p>\n  VDSSE\u306f\uff0c\n<\/p>\n<blockquote><p>\n  Dynamic Searchable Symmetric Encryption<br \/>\n  \uff0b<br \/>\n  Verifiability\n<\/p><\/blockquote>\n<p>\n  \u3068\u8003\u3048\u308c\u3070\u3088\u3044\uff0e\n<\/p>\n<p>\n  \u3064\u307e\u308a\uff0c<br \/>\n  \u300c\u6697\u53f7\u5316\u3057\u305f\u307e\u307e\u691c\u7d22\u3067\u304d\u308b\u300d<br \/>\n  \uff0b<br \/>\n  \u300c\u691c\u7d22\u7d50\u679c\u304c\u6b63\u3057\u3044\u304b\u78ba\u8a8d\u3067\u304d\u308b\u300d<br \/>\n  \u3068\u3044\u3046\u4ed5\u7d44\u307f\u3067\u3042\u308b\uff0e\n<\/p>\n<h3>3.6 Security Definitions<\/h3>\n<p>\n  \u5b89\u5168\u6027\u3092\u5927\u304d\u304f2\u3064\u306b\u5206\u3051\u308b\uff0e\n<\/p>\n<h4>Confidentiality<\/h4>\n<p>\n  \u8a31\u53ef\u3055\u308c\u305f\u6f0f\u6d29\u4ee5\u5916\u306e\u60c5\u5831\u3092\u30af\u30e9\u30a6\u30c9\u3078\u4e0e\u3048\u306a\u3044\u3053\u3068\uff0e\n<\/p>\n<h4>Soundness<\/h4>\n<p>\n  \u30af\u30e9\u30a6\u30c9\u304c\u5618\u306e\u691c\u7d22\u7d50\u679c\u3092\u8fd4\u3057\u3066\u3082\uff0c<br \/>\n  \u691c\u8a3c\u3067\u767a\u898b\u3067\u304d\u308b\u3053\u3068\uff0e\n<\/p>\n<p>\n  \u672c\u8ad6\u6587\u3067\u306f\uff0c\u7279\u306b<br \/>\n  \u300c\u30af\u30e9\u30a6\u30c9\u304c\u8aa4\u3063\u305f\u691c\u7d22\u7d50\u679c\u3092\u8fd4\u3057\u3066\uff0c<br \/>\n  \u305d\u308c\u306a\u306e\u306b\u691c\u8a3c\u3092\u901a\u904e\u3057\u3066\u3057\u307e\u3046\u300d<br \/>\n  \u3053\u3068\u304c\u8d77\u3053\u3089\u306a\u3044\u3053\u3068\u3092Soundness\u3068\u3057\u3066\u5b9a\u7fa9\u3059\u308b\uff0e\n<\/p>\n<hr>\n<h2>\u7b2c4\u7ae0 Verifiable SSE with Static Data<\/h2>\n<p>\n  \u3053\u3053\u3067\u306f\u307e\u305a\uff0c<br \/>\n  <strong>\u30c7\u30fc\u30bf\u304c\u66f4\u65b0\u3055\u308c\u306a\u3044\u9759\u7684SSE<\/strong><br \/>\n  \u3092\u691c\u8a3c\u53ef\u80fd\u306b\u3059\u308b\u65b9\u6cd5\u3092\u8003\u3048\u308b\uff0e\n<\/p>\n<h3>4.1 \u65e2\u5b58\u65b9\u5f0f\u306e\u554f\u984c<\/h3>\n<p>\n  \u4f8b\u3048\u3070\u30ad\u30fc\u30ef\u30fc\u30c9\u300c\u732b\u300d\u306b\u5bfe\u5fdc\u3059\u308b\u6587\u66f8ID\u304c\uff0c\n<\/p>\n<pre>\r\ndoc1\r\ndoc2\r\ndoc3\r\n<\/pre>\n<p>\n  \u3060\u3063\u305f\u3068\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u3053\u308c\u3089\u3092\u9023\u7d50\u3057\u3066\u30cf\u30c3\u30b7\u30e5\u3057\uff0c\n<\/p>\n<pre>\r\ntag = H(doc1 || doc2 || doc3)\r\n<\/pre>\n<p>\n  \u306e\u3088\u3046\u306a\u30bf\u30b0\u3092\u4f5c\u308c\u3070\uff0c<br \/>\n  \u691c\u7d22\u7d50\u679c\u304c\u6b63\u3057\u3044\u304b\u78ba\u8a8d\u3067\u304d\u305d\u3046\u306b\u898b\u3048\u308b\uff0e\n<\/p>\n<p>\n  \u3057\u304b\u3057\uff0c\u3053\u306e\u30bf\u30b0\u307e\u3067\u30af\u30e9\u30a6\u30c9\u3078\u9810\u3051\u308b\u3068\u554f\u984c\u304c\u3042\u308b\uff0e\n<\/p>\n<p>\n  \u4f8b\u3048\u3070\u672c\u6765\u300c\u72ac\u300d\u306e\u691c\u7d22\u7d50\u679c\u3092\u8fd4\u3059\u3079\u304d\u3068\u3053\u308d\u306b\uff0c<br \/>\n  \u904e\u53bb\u306b\u5f97\u305f\u300c\u732b\u300d\u306e\u691c\u7d22\u7d50\u679c\u3068\u30bf\u30b0\u3092\u305d\u306e\u307e\u307e\u8fd4\u305b\u3070\uff0c<br \/>\n  \u5358\u7d14\u306a\u6574\u5408\u6027\u78ba\u8a8d\u3092\u901a\u904e\u3067\u304d\u3066\u3057\u307e\u3046\u53ef\u80fd\u6027\u304c\u3042\u308b\uff0e\n<\/p>\n<p>\n  \u3064\u307e\u308a\uff0c<br \/>\n  <strong>\u5358\u7d14\u306b\u691c\u7d22\u7d50\u679c\u3078\u30cf\u30c3\u30b7\u30e5\u3092\u4ed8\u3051\u308b\u3060\u3051\u3067\u306f\uff0c<br \/>\n  \u60aa\u610f\u3042\u308b\u30af\u30e9\u30a6\u30c9\u3092\u5341\u5206\u306b\u9632\u3052\u306a\u3044<\/strong><br \/>\n  \u3068\u6307\u6458\u3059\u308b\uff0e\n<\/p>\n<h3>4.2 \u63d0\u6848\u3059\u308b\u6c4e\u7528\u65b9\u5f0f \u03a8s<\/h3>\n<p>\n  \u672c\u8ad6\u6587\u3067\u306f\uff0c<br \/>\n  \u65e2\u5b58\u306eSSE\u65b9\u5f0f\u306b\u8ffd\u52a0\u60c5\u5831\u3092\u4ed8\u4e0e\u3059\u308b\u3053\u3068\u3067\uff0c<br \/>\n  \u691c\u8a3c\u53ef\u80fd\u306b\u3059\u308b\u6c4e\u7528\u7684\u306a\u69cb\u6210\u3092\u63d0\u6848\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u5404\u30ad\u30fc\u30ef\u30fc\u30c9\u306b\u3064\u3044\u3066\uff0c<br \/>\n  \u305d\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u306b\u5bfe\u5fdc\u3059\u308b\u6587\u66f8ID\u5217\u304b\u3089\u30bf\u30b0\u3092\u4f5c\u308b\uff0e\n<\/p>\n<pre>\r\ntag_w = H(k_w || id1 || id2 || ... || idc)\r\n<\/pre>\n<p>\n  \u3053\u3053\u3067k_w\u306f\u30ad\u30fc\u30ef\u30fc\u30c9\u306b\u5bfe\u5fdc\u3059\u308b\u79d8\u5bc6\u60c5\u5831\u3067\u3042\u308b\uff0e\n<\/p>\n<p>\n  \u691c\u7d22\u6642\u306b\u306f\u901a\u5e38\u306eSSE\u691c\u7d22\u3092\u5b9f\u884c\u3057\uff0c<br \/>\n  \u5f97\u3089\u308c\u305f\u6587\u66f8ID\u5217\u304b\u3089\u518d\u3073\u30bf\u30b0\u3092\u8a08\u7b97\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u305d\u306e\u30bf\u30b0\u304c\u4fdd\u5b58\u3055\u308c\u3066\u3044\u308b\u30bf\u30b0\u3068\u4e00\u81f4\u3059\u308c\u3070\uff0c<br \/>\n  \u691c\u7d22\u7d50\u679c\u3092\u53d7\u7406\u3059\u308b\uff0e\n<\/p>\n<h3>\u3053\u306e\u7ae0\u306e\u30dd\u30a4\u30f3\u30c8<\/h3>\n<p>\n  <strong><br \/>\n    \u300c\u65e2\u5b58SSE\u3092\u4f5c\u308a\u76f4\u3059\u306e\u3067\u306f\u306a\u304f\uff0c<br \/>\n    \u691c\u8a3c\u7528\u306e\u30bf\u30b0\u3092\u8ffd\u52a0\u3059\u308b\u3060\u3051\u3067\u691c\u8a3c\u53ef\u80fd\u306b\u3059\u308b\u300d<br \/>\n  <\/strong><br \/>\n  \u3068\u3044\u3046\u6c4e\u7528\u7684\u306a\u30a2\u30a4\u30c7\u30a2\u3092\u793a\u3057\u3066\u3044\u308b\uff0e\n<\/p>\n<p>\n  Owner\u5074\u306f\u691c\u7d22\u7d50\u679c\u306b\u3064\u3044\u3066\u30cf\u30c3\u30b7\u30e5\u5024\u30921\u56de\u8a08\u7b97\u3059\u308b\u7a0b\u5ea6\u306e<br \/>\n  \u5c0f\u3055\u306a\u8ffd\u52a0\u8a08\u7b97\u3067\u691c\u8a3c\u3067\u304d\u308b\u3068\u3057\u3066\u3044\u308b\uff0e\n<\/p>\n<hr>\n<h2>\u7b2c5\u7ae0 Proposed Forward Secure Publicly Verifiable DSSE<\/h2>\n<p>\n  \u3053\u3053\u304c<strong>\u3053\u306e\u8ad6\u6587\u306e\u672c\u4e38<\/strong>\u3067\u3042\u308b\uff0e\n<\/p>\n<p>\n  \u7b2c4\u7ae0\u3067\u306f\u9759\u7684SSE\u3092\u691c\u8a3c\u53ef\u80fd\u306b\u3057\u305f\uff0e<br \/>\n  \u7b2c5\u7ae0\u3067\u306f\u3055\u3089\u306b\uff0c\n<\/p>\n<ul>\n<li>Dynamic<\/li>\n<li>Forward Private<\/li>\n<li>Publicly Verifiable<\/li>\n<\/ul>\n<p>\n  \u3092\u540c\u6642\u306b\u5b9f\u73fe\u3059\u308b\uff0e\n<\/p>\n<h3>5.1 \u57fa\u672c\u65b9\u91dd<\/h3>\n<p>\n  \u65e2\u5b58\u306eForward Private DSSE\u3092<br \/>\n  \u03a3f<br \/>\n  \u3068\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u672c\u8ad6\u6587\u306e\u65b9\u5f0f\u03a8f\u306f\uff0c<br \/>\n  \u3053\u306e\u03a3f\u3092\u4e38\u3054\u3068\u7f6e\u304d\u63db\u3048\u308b\u306e\u3067\u306f\u306a\u304f\uff0c<br \/>\n  <strong>\u691c\u8a3c\u7528\u306e\u6697\u53f7\u5316\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u8ffd\u52a0\u3059\u308b<\/strong><br \/>\n  \u3068\u3044\u3046\u8003\u3048\u65b9\u3092\u53d6\u308b\uff0e\n<\/p>\n<p>\n  \u3064\u307e\u308a\uff0c\n<\/p>\n<pre>\r\n\u65e2\u5b58Forward Private DSSE\r\n        \uff0b\r\n\u691c\u8a3c\u7528\u306e\u4ed5\u7d44\u307f\r\n        \u2193\r\nForward Private\r\nPublicly Verifiable\r\nDSSE\r\n<\/pre>\n<p>\n  \u3068\u3044\u3046\u69cb\u9020\u306b\u306a\u3063\u3066\u3044\u308b\uff0e\n<\/p>\n<h3>5.2 \u4f55\u3092\u4fdd\u5b58\u3059\u308b\u306e\u304b<\/h3>\n<p>\n  \u5404\u30ad\u30fc\u30ef\u30fc\u30c9w\u306b\u3064\u3044\u3066\uff0c<br \/>\n  \u305d\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u542b\u3080\u6587\u66f8\u6570cw\u3092Owner\u5074\u3067\u7ba1\u7406\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u307e\u305f\uff0c\n<\/p>\n<ul>\n<li>Ks\uff1a\u691c\u7d22\u7528\u306eseed\u751f\u6210\u306b\u5229\u7528<\/li>\n<li>Kt\uff1akeyword tag\u751f\u6210\u306b\u5229\u7528<\/li>\n<li>sk \/ pk\uff1aBLS\u7f72\u540d\u306e\u79d8\u5bc6\u9375\u30fb\u516c\u958b\u9375<\/li>\n<li>K\u03a3f\uff1a\u7d44\u307f\u8fbc\u3080Forward Private DSSE\u306e\u9375<\/li>\n<\/ul>\n<p>\n  \u306a\u3069\u3092\u7528\u610f\u3059\u308b\uff0e\n<\/p>\n<h3>5.3 Keyword Tag<\/h3>\n<p>\n  \u5404\u30ad\u30fc\u30ef\u30fc\u30c9\u306b\u3064\u3044\u3066\uff0c\n<\/p>\n<pre>\r\ntag_w = F(Kt, w)\r\n<\/pre>\n<p>\n  \u306e\u3088\u3046\u306a\u56fa\u5b9a\u30bf\u30b0\u3092\u4f5c\u308b\uff0e\n<\/p>\n<p>\n  \u305f\u3060\u3057\uff0c\u3053\u306e\u30bf\u30b0\u305d\u306e\u3082\u306e\u304b\u3089\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u5206\u304b\u3089\u306a\u3044\u3088\u3046\u306b\u3059\u308b\uff0e\n<\/p>\n<h3>5.4 Keyword-Document Pair\u3054\u3068\u306e\u4f4d\u7f6e<\/h3>\n<p>\n  \u30ad\u30fc\u30ef\u30fc\u30c9w\u3068\u6587\u66f8ID id\u306e\u7d44\u3054\u3068\u306b\uff0c\n<\/p>\n<pre>\r\npos = F(tag_w, id || i)\r\n<\/pre>\n<p>\n  \u306e\u3088\u3046\u306a\u4f4d\u7f6e\u60c5\u5831\u3092\u4f5c\u308b\uff0e\n<\/p>\n<p>\n  \u3053\u306epos\u3092\uff0c\u30af\u30e9\u30a6\u30c9\u4e0a\u306e\u7f72\u540d\u30c6\u30fc\u30d6\u30ebTsig\u306e<br \/>\n  key-value\u69cb\u9020\u306b\u304a\u3051\u308b\u30ad\u30fc\u3068\u3057\u3066\u5229\u7528\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u91cd\u8981\u306a\u306e\u306f\uff0c<br \/>\n  <strong><br \/>\n    \u30af\u30e9\u30a6\u30c9\u306f\u691c\u7d22\u7d50\u679c\u3068\u3057\u3066\u6b63\u3057\u3044\u6587\u66f8ID\u3092\u5f97\u306a\u3044\u9650\u308a\uff0c<br \/>\n    \u5bfe\u5fdc\u3059\u308b\u7f72\u540d\u306e\u4f4d\u7f6e\u3092\u6b63\u3057\u304f\u6c42\u3081\u3089\u308c\u306a\u3044<br \/>\n  <\/strong><br \/>\n  \u3068\u3044\u3046\u70b9\u3067\u3042\u308b\uff0e\n<\/p>\n<h3>5.5 BLS\u7f72\u540d<\/h3>\n<p>\n  \u5404keyword-document pair\u306b\u3064\u3044\u3066\u7f72\u540d\u3092\u4f5c\u308b\uff0e\n<\/p>\n<p>\n  \u7f72\u540d\u306f\u5358\u7d14\u306b\u6587\u66f8ID\u3060\u3051\u3078\u4ed8\u3051\u308b\u306e\u3067\u306f\u306a\u304f\uff0c<br \/>\n  \u30ad\u30fc\u30ef\u30fc\u30c9\u3068\u30e9\u30f3\u30c0\u30e0\u5024\u306a\u3069\u3068\u7d50\u3073\u4ed8\u3051\u308b\uff0e\n<\/p>\n<p>\n  \u3053\u308c\u306b\u3088\u308a\uff0c<br \/>\n  \u300c\u5225\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u306e\u691c\u7d22\u7d50\u679c\u3092\u6d41\u7528\u3059\u308b\u300d<br \/>\n  \u300c\u6587\u66f8ID\u3092\u6539\u3056\u3093\u3059\u308b\u300d<br \/>\n  \u3068\u3044\u3063\u305f\u653b\u6483\u3092\u691c\u8a3c\u3067\u691c\u51fa\u3067\u304d\u308b\uff0e\n<\/p>\n<h3>5.6 Initialization<\/h3>\n<p>\n  \u521d\u671f\u5316\u6642\u306b\u306f\uff0c\n<\/p>\n<ol>\n<li>\u79d8\u5bc6\u9375\u30fb\u516c\u958b\u9375\u3092\u751f\u6210\u3059\u308b\uff0e<\/li>\n<li>\u65e2\u5b58\u306eForward Private DSSE\u306e\u9375\u3092\u751f\u6210\u3059\u308b\uff0e<\/li>\n<li>\u691c\u7d22\u7528seed\u3068tag\u7528\u306e\u79d8\u5bc6\u5024\u3092\u751f\u6210\u3059\u308b\uff0e<\/li>\n<li>\u5404keyword-document pair\u306b\u3064\u3044\u3066\u7f72\u540d\u3092\u4f5c\u308b\uff0e<\/li>\n<li>\u7f72\u540d\u3092\u4f4d\u7f6e\u60c5\u5831\u3068\u5bfe\u5fdc\u4ed8\u3051\u3066Tsig\u3078\u683c\u7d0d\u3059\u308b\uff0e<\/li>\n<li>\u901a\u5e38\u306eForward Private DSSE\u306e\u691c\u7d22\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3082\u69cb\u7bc9\u3059\u308b\uff0e<\/li>\n<li>\u03b3\uff0c\u6697\u53f7\u5316DB\uff0cTsig\u3092\u30af\u30e9\u30a6\u30c9\u3078\u9810\u3051\u308b\uff0e<\/li>\n<\/ol>\n<h3>5.7 Search Phase<\/h3>\n<p>\n  \u300c\u732b\u300d\u3067\u691c\u7d22\u3059\u308b\u3068\u3059\u308b\uff0e\n<\/p>\n<p>\n  Owner\u306f\u307e\u305a\uff0c<br \/>\n  \u7d44\u307f\u8fbc\u307e\u308c\u3066\u3044\u308bForward Private DSSE\u306e\u691c\u7d22\u30c8\u30fc\u30af\u30f3\u3092\u751f\u6210\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u3055\u3089\u306b\uff0c\n<\/p>\n<pre>\r\ntag_cat\r\nseed_cat\r\n<\/pre>\n<p>\n  \u3092\u751f\u6210\u3057\u3066\u30af\u30e9\u30a6\u30c9\u3078\u6e21\u3059\uff0e\n<\/p>\n<p>\n  \u30af\u30e9\u30a6\u30c9\u306f\u901a\u5e38\u306eDSSE\u691c\u7d22\u3092\u5b9f\u884c\u3057\u3066\uff0c<br \/>\n  \u6587\u66f8ID\u96c6\u5408\u3092\u5f97\u308b\uff0e\n<\/p>\n<p>\n  \u4f8b\u3048\u3070\uff0c\n<\/p>\n<pre>\r\ndoc1\r\ndoc2\r\ndoc3\r\n<\/pre>\n<p>\n  \u304c\u5f97\u3089\u308c\u305f\u3068\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u30af\u30e9\u30a6\u30c9\u306f\u5404\u6587\u66f8ID\u306b\u3064\u3044\u3066\u5bfe\u5fdc\u3059\u308bpos\u3092\u8a08\u7b97\u3057\uff0c<br \/>\n  Tsig\u304b\u3089\u5bfe\u5fdc\u3059\u308b\u7f72\u540d\u3092\u53d6\u5f97\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u305d\u3057\u3066\u53d6\u5f97\u3057\u305f\u8907\u6570\u306e\u7f72\u540d\u3092\u307e\u3068\u3081\u3066\uff0c<br \/>\n  1\u3064\u306e\u96c6\u7d04\u7f72\u540d\u3068\u3057\u3066Auditor\u3078\u9001\u308b\uff0e\n<\/p>\n<h3>5.8 Auditor\u306b\u3088\u308b\u691c\u8a3c<\/h3>\n<p>\n  Owner\u5074\u3082\u691c\u7d22\u7d50\u679c\u3092\u5229\u7528\u3057\u3066\uff0c<br \/>\n  \u30e9\u30f3\u30c0\u30e0\u5024\u3092\u4f7f\u3063\u305f\u30e1\u30c3\u30bb\u30fc\u30b8m\u3092\u751f\u6210\u3059\u308b\uff0e\n<\/p>\n<p>\n  Auditor\u306b\u306f\uff0c\n<\/p>\n<ul>\n<li>Owner\u5074\u304c\u751f\u6210\u3057\u305f\u691c\u8a3c\u7528\u30e1\u30c3\u30bb\u30fc\u30b8<\/li>\n<li>Cloud\u5074\u304c\u751f\u6210\u3057\u305f\u96c6\u7d04\u7f72\u540d<\/li>\n<\/ul>\n<p>\n  \u304c\u6e21\u3055\u308c\u308b\uff0e\n<\/p>\n<p>\n  Auditor\u306fBLS\u7f72\u540d\u306eVerify\u3092\u5b9f\u884c\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u691c\u8a3c\u306b\u6210\u529f\u3059\u308c\u3070\uff0c\n<\/p>\n<blockquote><p>\n  Cloud\u304c\u8fd4\u3057\u305f\u691c\u7d22\u7d50\u679c\u306f\uff0c\u6b63\u3057\u3044\u7d50\u679c\u96c6\u5408\u306b\u5bfe\u5fdc\u3057\u3066\u3044\u308b\n<\/p><\/blockquote>\n<p>\n  \u3068\u5224\u65ad\u3067\u304d\u308b\uff0e\n<\/p>\n<p>\n  \u3057\u304b\u3082Auditor\u306f\u691c\u7d22\u7d50\u679c\u306e\u5185\u5bb9\u305d\u306e\u3082\u306e\u3092\u77e5\u308b\u5fc5\u8981\u304c\u306a\u3044\uff0e\n<\/p>\n<h3>5.9 Update Phase<\/h3>\n<p>\n  \u65b0\u3057\u3044\u6587\u66f8\u3092\u8ffd\u52a0\u3059\u308b\u3068\u304d\u306f\uff0c<br \/>\n  \u305d\u306e\u6587\u66f8\u306b\u542b\u307e\u308c\u308b\u5404\u30ad\u30fc\u30ef\u30fc\u30c9\u306b\u3064\u3044\u3066\u51e6\u7406\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u4f8b\u3048\u3070\uff0c\n<\/p>\n<pre>\r\ndoc4 = \u300c\u732b\u30ab\u30d5\u30a7\u300d\r\n<\/pre>\n<p>\n  \u306a\u3089\uff0c\n<\/p>\n<pre>\r\n\u732b \u2192 doc4\r\n\u30ab\u30d5\u30a7 \u2192 doc4\r\n<\/pre>\n<p>\n  \u305d\u308c\u305e\u308c\u306b\u3064\u3044\u3066\uff0c<br \/>\n  Forward Private DSSE\u306e\u66f4\u65b0\u51e6\u7406\u3068\uff0c<br \/>\n  \u691c\u8a3c\u7528\u306eposition\u30fb\u7f72\u540d\u306e\u8ffd\u52a0\u3092\u884c\u3046\uff0e\n<\/p>\n<p>\n  \u30af\u30e9\u30a6\u30c9\u306b\u306f\u5358\u7d14\u306akey-value pair\u3068\u3057\u3066\u8ffd\u52a0\u3055\u308c\u308b\u305f\u3081\uff0c<br \/>\n  \u8ffd\u52a0\u3055\u308c\u305f\u30c7\u30fc\u30bf\u304b\u3089\u76f4\u63a5\u30ad\u30fc\u30ef\u30fc\u30c9\u3092\u63a8\u6e2c\u3059\u308b\u3053\u3068\u304c\u96e3\u3057\u3044\uff0e\n<\/p>\n<h3>5.10 Forward Privacy<\/h3>\n<p>\n  \u672c\u65b9\u5f0f\u3067\u306f\uff0c\u65b0\u3057\u3044keyword-document pair\u3092\u8ffd\u52a0\u3057\u3066\u3082\uff0c<br \/>\n  \u305d\u306e\u8ffd\u52a0\u30c7\u30fc\u30bf\u304c\u904e\u53bb\u306e\u691c\u7d22\u7d50\u679c\u306e\u3069\u308c\u306b\u5bfe\u5fdc\u3059\u308b\u306e\u304b\u3092<br \/>\n  \u30af\u30e9\u30a6\u30c9\u304c\u76f4\u63a5\u5224\u65ad\u3067\u304d\u306a\u3044\u3088\u3046\u306b\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u7279\u306b\uff0c\u6587\u66f8ID\u304b\u3089\u30af\u30e9\u30a6\u30c9\u4e0a\u306e\u6587\u66f8\u540d\u3092\u76f4\u63a5\u5fa9\u5143\u3067\u304d\u306a\u3044\u3088\u3046\u306b<br \/>\n  \u4e00\u65b9\u5411\u95a2\u6570H0\u3092\u5229\u7528\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u305d\u306e\u305f\u3081\uff0c<br \/>\n  \u65b0\u3057\u3044\u6587\u66f8\u306e\u8ffd\u52a0\u3068\u904e\u53bb\u306e\u691c\u7d22\u7d50\u679c\u3068\u306e\u30ea\u30f3\u30af\u3092<br \/>\n  \u30af\u30e9\u30a6\u30c9\u304b\u3089\u96a0\u3059\u3053\u3068\u3092\u72d9\u3063\u3066\u3044\u308b\uff0e\n<\/p>\n<h3>5.11 Soundness<\/h3>\n<p>\n  \u30af\u30e9\u30a6\u30c9\u304c\u4e0d\u6b63\u306a\u7d50\u679c\u3092\u8fd4\u3059\u5834\u5408\u306b\u3064\u3044\u3066\u691c\u8a0e\u3057\u3066\u3044\u308b\uff0e\n<\/p>\n<p>\n  \u4e3b\u306b\u4ee5\u4e0b\u306e3\u7a2e\u985e\u3092\u8003\u3048\u308b\uff0e\n<\/p>\n<ol>\n<li>\u6587\u66f8ID\u306e\u6570\u3092\u52dd\u624b\u306b\u5909\u3048\u308b\uff0e<\/li>\n<li>\u5225\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u3068\u540c\u3058\u4ef6\u6570\u306e\u7d50\u679c\u3092\u8fd4\u3059\uff0e<\/li>\n<li>\u6587\u66f8ID\u305d\u306e\u3082\u306e\u3092\u6539\u3056\u3093\u3059\u308b\uff0e<\/li>\n<\/ol>\n<p>\n  \u3057\u304b\u3057\u7f72\u540d\u304c\u30ad\u30fc\u30ef\u30fc\u30c9\u3084\u30e9\u30f3\u30c0\u30e0\u5024\u306a\u3069\u3068\u7d50\u3073\u4ed8\u3044\u3066\u3044\u308b\u305f\u3081\uff0c<br \/>\n  \u6539\u3056\u3093\u3055\u308c\u305f\u7d50\u679c\u3067\u306f\u7f72\u540d\u691c\u8a3c\u306b\u5931\u6557\u3059\u308b\u3068\u8aac\u660e\u3057\u3066\u3044\u308b\uff0e\n<\/p>\n<h3>5.12 Deletion Support<\/h3>\n<p>\n  \u524a\u9664\u306b\u3082\u62e1\u5f35\u53ef\u80fd\u3068\u3057\u3066\u3044\u308b\uff0e\n<\/p>\n<p>\n  \u8ffd\u52a0\u7528\u306e\u65b9\u5f0f\u3068\u306f\u5225\u306b\uff0c<br \/>\n  \u524a\u9664\u3055\u308c\u305f\u30d5\u30a1\u30a4\u30eb\u3092\u6271\u3046\u305f\u3081\u306e\u8907\u88fd\u3055\u308c\u305f\u69cb\u9020\u03a8'f\u3092\u4fdd\u6301\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u691c\u7d22\u6642\u306b\u306f\u8ffd\u52a0\u5074\u3068\u524a\u9664\u5074\u306e\u4e21\u65b9\u3092\u691c\u8a3c\u3057\uff0c<br \/>\n  \u6700\u7d42\u7684\u306a\u7d50\u679c\u3092\u5dee\u3057\u5f15\u304d\u306b\u3088\u3063\u3066\u6c42\u3081\u308b\uff0e\n<\/p>\n<hr>\n<h2>\u7b2c6\u7ae0 Comparison with Existing Schemes<\/h2>\n<p>\n  \u65e2\u5b58\u306e\u691c\u8a3c\u53ef\u80fdDSSE\u65b9\u5f0f\u3068\uff0c<br \/>\n  \u672c\u8ad6\u6587\u306e\u03a8f\u3092\u6bd4\u8f03\u3057\u3066\u3044\u308b\uff0e\n<\/p>\n<h3>6.1 \u672c\u65b9\u5f0f\u306e\u7279\u5fb4<\/h3>\n<p>\n  \u672c\u65b9\u5f0f\u03a8f\u306f\uff0c\n<\/p>\n<ul>\n<li>Forward Privacy\uff1a\u3042\u308a<\/li>\n<li>Public Verifiability\uff1a\u3042\u308a<\/li>\n<li>Owner\u5074\u306e\u8ffd\u52a0\u30b9\u30c8\u30ec\u30fc\u30b8\uff1aO(1)<\/li>\n<li>Cloud\u5074\u306e\u8ffd\u52a0\u30b9\u30c8\u30ec\u30fc\u30b8\uff1aO(N)<\/li>\n<li>Owner\u5074\u306e\u691c\u7d22\u6642\u8ffd\u52a0\u8a08\u7b97\uff1aO(|Rw|)<\/li>\n<li>Auditor\u3068\u306e\u8ffd\u52a0\u901a\u4fe1\uff1aO(1)<\/li>\n<\/ul>\n<p>\n  \u3068\u3044\u3046\u7279\u5fb4\u3092\u6301\u3064\uff0e\n<\/p>\n<p>\n  \u3053\u3053\u3067N\u306fkeyword-document pair\u306e\u7dcf\u6570\uff0c<br \/>\n  |Rw|\u306f\u691c\u7d22\u7d50\u679c\u6570\u3067\u3042\u308b\uff0e\n<\/p>\n<h3>6.2 Owner\u5074\u306e\u8ca0\u62c5<\/h3>\n<p>\n  \u3053\u306e\u8ad6\u6587\u304c\u7279\u306b\u91cd\u8996\u3057\u3066\u3044\u308b\u306e\u304c\uff0c<br \/>\n  <strong>Owner\u5074\u3092\u8efd\u91cf\u306b\u3059\u308b\u3053\u3068<\/strong><br \/>\n  \u3067\u3042\u308b\uff0e\n<\/p>\n<p>\n  Cloud\u306f\u8a08\u7b97\u8cc7\u6e90\u304c\u8c4a\u5bcc\u3067\u3042\u308b\u4e00\u65b9\uff0c<br \/>\n  Owner\u306f\u8a08\u7b97\u80fd\u529b\u3084\u30b9\u30c8\u30ec\u30fc\u30b8\u304c\u9650\u3089\u308c\u3066\u3044\u308b\u3068\u4eee\u5b9a\u3057\u3066\u3044\u308b\uff0e\n<\/p>\n<p>\n  \u305d\u306e\u305f\u3081\uff0c<br \/>\n  \u691c\u8a3c\u51e6\u7406\u306e\u4e00\u90e8\u3092Auditor\u3078\u79fb\u3057\uff0c<br \/>\n  Owner\u306e\u8ca0\u62c5\u3092\u5c0f\u3055\u304f\u3059\u308b\uff0e\n<\/p>\n<p>\n  \u672c\u65b9\u5f0f\u3067\u306f\uff0c<br \/>\n  \u691c\u7d22\u7d50\u679c\u306e\u4ef6\u6570\u306b\u6bd4\u4f8b\u3057\u305f\u6574\u6570\u306e\u4e57\u7b97\u30fb\u52a0\u7b97\u3092Owner\u304c\u884c\u3046\u5fc5\u8981\u304c\u3042\u308b\u304c\uff0c<br \/>\n  \u4ed6\u65b9\u5f0f\u3068\u6bd4\u8f03\u3057\u3066\u5c0f\u3055\u3044\u3068\u3057\u3066\u3044\u308b\uff0e\n<\/p>\n<h3>6.3 \u30b9\u30c8\u30ec\u30fc\u30b8\u30b3\u30b9\u30c8<\/h3>\n<p>\n  \u691c\u8a3c\u7528\u306e\u7f72\u540d\u3092keyword-document pair\u3054\u3068\u306b\u4fdd\u5b58\u3059\u308b\u305f\u3081\uff0c<br \/>\n  Cloud\u5074\u306e\u8ffd\u52a0\u30b9\u30c8\u30ec\u30fc\u30b8\u306fO(N)\u3068\u306a\u308b\uff0e\n<\/p>\n<p>\n  \u3064\u307e\u308a\uff0c\n<\/p>\n<pre>\r\n\u691c\u7d22\u53ef\u80fd\u6697\u53f7\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\r\n+\r\n\u691c\u8a3c\u7528\u7f72\u540d\u30c6\u30fc\u30d6\u30eb\r\n<\/pre>\n<p>\n  \u3068\u3044\u3046\u69cb\u6210\u306b\u306a\u308b\uff0e\n<\/p>\n<p>\n  \u4e00\u65b9\uff0c<br \/>\n  Owner\u5074\u306b\u306f\u691c\u8a3c\u306e\u305f\u3081\u306e\u8ffd\u52a0\u30b9\u30c8\u30ec\u30fc\u30b8\u3092\u8981\u6c42\u3057\u306a\u3044\u3053\u3068\u304c\u7279\u5fb4\u3067\u3042\u308b\uff0e\n<\/p>\n<hr>\n<h2>\u7b2c7\u7ae0 Conclusion<\/h2>\n<p>\n  \u672c\u8ad6\u6587\u3067\u306f\uff0c\n  <\/p>\n<blockquote><p>\n  Forward Private DSSE<br \/>\n  \uff0b<br \/>\n  Public Verifiability\n<\/p><\/blockquote>\n<p>\n  \u3092\u5b9f\u73fe\u3059\u308b\u6c4e\u7528\u7684\u306a\u65b9\u5f0f\u3092\u63d0\u6848\u3057\u305f\uff0e\n<\/p>\n<p>\n  \u307e\u305f\uff0c<br \/>\n  \u9759\u7684SSE\u3092\u691c\u8a3c\u53ef\u80fd\u306b\u3059\u308b\u65b9\u5f0f\u03a8s\u3068\uff0c<br \/>\n  \u52d5\u7684\u304b\u3064Forward Private\u306aDSSE\u3092\u691c\u8a3c\u53ef\u80fd\u306b\u3059\u308b\u65b9\u5f0f\u03a8f\u3092\u793a\u3057\u305f\uff0e\n<\/p>\n<p>\n  \u3069\u3061\u3089\u3082\u6bd4\u8f03\u7684\u5358\u7d14\u306a\u69cb\u9020\u3067\u5b9f\u88c5\u53ef\u80fd\u3067\u3042\u308a\uff0c<br \/>\n  \u7279\u306b\u30ea\u30bd\u30fc\u30b9\u306e\u5c11\u306a\u3044Owner\u5074\u306e\u8a08\u7b97\u91cf\u30fb\u901a\u4fe1\u91cf\u3092\u6291\u3048\u308b\u3053\u3068\u3092\u76ee\u6a19\u3068\u3057\u3066\u3044\u308b\uff0e\n<\/p>\n<p>\n  \u4e00\u65b9\u3067\uff0c<br \/>\n  \u672c\u8ad6\u6587\u306e\u65b9\u5f0f\u306f<strong>\u5358\u4e00\u30ad\u30fc\u30ef\u30fc\u30c9\u691c\u7d22<\/strong>\u3092\u5bfe\u8c61\u3068\u3057\u3066\u3044\u308b\uff0e\n<\/p>\n<p>\n  \u4eca\u5f8c\u306e\u8ab2\u984c\u3068\u3057\u3066\uff0c\n<\/p>\n<ul>\n<li>\u8907\u5408\u30ad\u30fc\u30ef\u30fc\u30c9\u691c\u7d22<\/li>\n<li>Boolean Query<\/li>\n<li>\u3088\u308a\u8907\u96d1\u306a\u30af\u30a8\u30ea<\/li>\n<li>Forward Privacy\u3092\u7dad\u6301\u3057\u305f\u8907\u96d1\u306a\u691c\u7d22<\/li>\n<\/ul>\n<p>\n  \u306a\u3069\u304c\u6319\u3052\u3089\u308c\u3066\u3044\u308b\uff0e\n<\/p>\n<hr>\n<h2>\u3053\u306e\u8ad6\u6587\u3092\u8d85\u3056\u3063\u304f\u308a\u56f3\u89e3\u3059\u308b\u3068<\/h2>\n<pre>\r\n\u3010\u901a\u5e38\u306eDSSE\u3011\r\n\r\nOwner\r\n  \u2502\r\n  \u2502 \u691c\u7d22\u30c8\u30fc\u30af\u30f3\r\n  \u25bc\r\nCloud\r\n  \u2502\r\n  \u2502 \u691c\u7d22\r\n  \u25bc\r\n\u691c\u7d22\u7d50\u679c\r\n  \u2502\r\n  \u25bc\r\nOwner\r\n\r\n\r\n\u554f\u984c\uff1a\r\nCloud\u304c\u5618\u306e\u7d50\u679c\u3092\u8fd4\u3057\u3066\u3082\u5206\u304b\u3089\u306a\u3044\r\n\r\n\r\n\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\r\n\r\n\r\n\u3010\u3053\u306e\u8ad6\u6587\u3011\r\n\r\nOwner\r\n  \u2502\r\n  \u251c\u2500\u2500\u2500\u2500 \u691c\u7d22\u30c8\u30fc\u30af\u30f3 \u2500\u2500\u2500\u2500\u2500\u2500\u25ba Cloud\r\n  \u2502                              \u2502\r\n  \u2502                              \u2502 \u691c\u7d22\r\n  \u2502                              \u25bc\r\n  \u2502                         \u691c\u7d22\u7d50\u679c\uff0b\u7f72\u540d\r\n  \u2502                              \u2502\r\n  \u2502                              \u25bc\r\n  \u2502                           Auditor\r\n  \u2502                              \u2502\r\n  \u2502                         \u7f72\u540d\u3092\u691c\u8a3c\r\n  \u2502                              \u2502\r\n  \u2502                              \u25bc\r\n  \u2502                       \u300c\u6b63\u3057\u3044\uff0f\u4e0d\u6b63\u300d\r\n  \u2502\r\n  \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500 \u691c\u8a3c\u7528\u60c5\u5831 \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u25ba Auditor\r\n\r\n\r\n\u30dd\u30a4\u30f3\u30c8\uff1a\r\n\r\n\u2460 DSSE\u306a\u306e\u3067\u6697\u53f7\u5316\u3057\u305f\u307e\u307e\u691c\u7d22\u3067\u304d\u308b\r\n\u2461 Dynamic\u306a\u306e\u3067\u30c7\u30fc\u30bf\u3092\u8ffd\u52a0\u3067\u304d\u308b\r\n\u2462 Forward Private\u306a\u306e\u3067\u8ffd\u52a0\u306b\u3088\u308b\u60c5\u5831\u6f0f\u6d29\u3092\u6291\u3048\u308b\r\n\u2463 Publicly Verifiable\u306a\u306e\u3067\u7b2c\u4e09\u8005Auditor\u304c\u7d50\u679c\u3092\u691c\u8a3c\u3067\u304d\u308b\r\n\u2464 Owner\u5074\u306e\u8ca0\u62c5\u3092\u5c0f\u3055\u304f\u3059\u308b\r\n<\/pre>\n<hr>\n<h2>\u3042\u306a\u305f\u306e\u7814\u7a76\u3068\u306e\u95a2\u4fc2<\/h2>\n<p>\n  \u3053\u306e\u8ad6\u6587\u3092\u3042\u306a\u305f\u306e\u7814\u7a76\u306e\u6587\u8108\u3067\u8aad\u3080\u306a\u3089\uff0c<br \/>\n  \u7279\u306b\u91cd\u8981\u306a\u306e\u306f<strong>\u300c\u691c\u7d22\u53ef\u80fd\u6697\u53f7\u305d\u306e\u3082\u306e\u300d\u3088\u308a\uff0c<br \/>\n  \u691c\u7d22\u7d50\u679c\u306e\u4fe1\u983c\u6027\u3092\u3069\u3046\u62c5\u4fdd\u3059\u308b\u304b<\/strong>\u3068\u3044\u3046\u90e8\u5206\u3067\u3042\u308b\uff0e\n<\/p>\n<p>\n  \u3042\u306a\u305f\u306eOS\u7d71\u5408\u578b\u691c\u7d22\u53ef\u80fd\u6697\u53f7\u30b7\u30b9\u30c6\u30e0\u306b\u5f53\u3066\u306f\u3081\u308b\u3068\uff0c<br \/>\n  \u73fe\u5728\u306e\u57fa\u672c\u69cb\u9020\u304c\uff0c\n<\/p>\n<pre>\r\nOS\r\n \u2193\r\n\u691c\u7d22\u30c8\u30fc\u30af\u30f3\u751f\u6210\r\n \u2193\r\n\u30af\u30e9\u30a6\u30c9\r\n \u2193\r\n\u6697\u53f7\u5316DB\u3092\u691c\u7d22\r\n \u2193\r\n\u7d50\u679c\u3092\u8fd4\u3059\r\n<\/pre>\n<p>\n  \u3060\u3068\u3059\u308b\u3068\uff0c<br \/>\n  \u672c\u8ad6\u6587\u306f\u305d\u306e\u5f8c\u308d\u306b\uff0c\n<\/p>\n<pre>\r\n\u30af\u30e9\u30a6\u30c9\r\n \u2193\r\n\u300c\u672c\u5f53\u306b\u6b63\u3057\u3044\u691c\u7d22\u7d50\u679c\u3092\u8fd4\u3057\u305f\uff1f\u300d\r\n \u2193\r\nAuditor \/ \u691c\u8a3c\u51e6\u7406\r\n<\/pre>\n<p>\n  \u3092\u8ffd\u52a0\u3059\u308b\u7814\u7a76\u3060\u3068\u8003\u3048\u308b\u3068\u5206\u304b\u308a\u3084\u3059\u3044\uff0e\n<\/p>\n<p>\n  \u7279\u306b\u91cd\u8981\u306a\u306e\u306f\uff0c<br \/>\n  <strong><br \/>\n  \u300c\u6697\u53f7\u5316\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u30af\u30e9\u30a6\u30c9\u304b\u3089\u5185\u5bb9\u3092\u76d7\u307e\u308c\u306a\u3044\u300d<br \/>\n  <\/strong><br \/>\n  \u3068<br \/>\n  <strong><br \/>\n  \u300c\u30af\u30e9\u30a6\u30c9\u304c\u6b63\u3057\u3044\u7d50\u679c\u3092\u8fd4\u3057\u3066\u3044\u308b\u300d<br \/>\n  <\/strong><br \/>\n  \u306f\u5225\u554f\u984c\u3060\u3068\u3044\u3046\u70b9\u3067\u3042\u308b\uff0e\n<\/p>\n<p>\n  \u524d\u8005\u306f<strong>Confidentiality<\/strong>\uff0c<br \/>\n  \u5f8c\u8005\u306f<strong>Soundness \/ Verifiability<\/strong>\u306e\u554f\u984c\u3067\u3042\u308b\uff0e\n<\/p>\n<p>\n  \u3057\u305f\u304c\u3063\u3066\uff0c<br \/>\n  \u691c\u7d22\u53ef\u80fd\u6697\u53f7\u3092OS\u30ec\u30d9\u30eb\u3078\u7d71\u5408\u3059\u308b\u7814\u7a76\u3092\u8003\u3048\u308b\u5834\u5408\u3067\u3082\uff0c<br \/>\n  \u300c\u30af\u30e9\u30a6\u30c9\u3092\u4fe1\u7528\u3057\u306a\u304f\u3066\u3088\u3044\u300d\u3068\u3059\u308b\u306a\u3089\uff0c<br \/>\n  \u300c\u30af\u30e9\u30a6\u30c9\u304c\u8fd4\u3057\u305f\u691c\u7d22\u7d50\u679c\u81ea\u4f53\u3092\u4fe1\u7528\u3057\u3066\u3088\u3044\u306e\u304b\uff1f\u300d<br \/>\n  \u3068\u3044\u3046\u6b21\u306e\u554f\u984c\u304c\u81ea\u7136\u306b\u51fa\u3066\u304f\u308b\uff0e\n<\/p>\n<hr>\n<h2>\u4e00\u8a00\u3067\u307e\u3068\u3081\u308b\u3068<\/h2>\n<p>\n  <strong><br \/>\n  \u3053\u306e\u8ad6\u6587\u306f\uff0c<br \/>\n  \u300c\u30af\u30e9\u30a6\u30c9\u306b\u6697\u53f7\u5316\u30c7\u30fc\u30bf\u3092\u9810\u3051\u3066\u691c\u7d22\u3055\u305b\u308b\u3060\u3051\u3067\u306f\u306a\u304f\uff0c<br \/>\n  \u305d\u306e\u30af\u30e9\u30a6\u30c9\u304c\u8fd4\u3057\u305f\u691c\u7d22\u7d50\u679c\u304c\u6b63\u3057\u3044\u3053\u3068\u307e\u3067\u691c\u8a3c\u3067\u304d\u308b\uff0c<br \/>\n  Forward Private\u306a\u52d5\u7684\u691c\u7d22\u53ef\u80fd\u6697\u53f7\u3092\u4f5c\u3063\u305f\u300d<br \/>\n  \u3068\u3044\u3046\u8ad6\u6587\u3067\u3042\u308b\uff0e<br \/>\n  <\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u307e\u3058\u3048\u3050\u3044\u3063\u3059\uff0e<br \/>\nDSSE \u3068 Forward Privacy \u3068 \u30d5\u30a1\u30a4\u30eb\u6574\u5408\u6027\u4fdd\u8a3c\u3067\u3059\uff0e<br 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