[{"@context":"http:\/\/schema.org\/","@type":"BlogPosting","@id":"https:\/\/wiki.edu.vn\/jp\/wiki3\/archives\/8889#BlogPosting","mainEntityOfPage":"https:\/\/wiki.edu.vn\/jp\/wiki3\/archives\/8889","headline":"\u6697\u53f7\u6587\u5358\u72ec\u653b\u6483 – Wikipedia","name":"\u6697\u53f7\u6587\u5358\u72ec\u653b\u6483 – Wikipedia","description":"\u6697\u53f7\u6587\u5358\u72ec\u653b\u6483\uff08\u3042\u3093\u3054\u3046\u3076\u3093\u305f\u3093\u3069\u304f\u3053\u3046\u3052\u304d\u3001ciphertext-only attack\u3001COA\uff09\u307e\u305f\u306f\u65e2\u77e5\u6697\u53f7\u6587\u653b\u6483\uff08\u304d\u3061\u3042\u3093\u3054\u3046\u3076\u3093\u3053\u3046\u3052\u304d\u3001known ciphertext attack\uff09\u3068\u306f\u3001\u6697\u53f7\u7cfb (cryptosystem) \u306e\u5f37\u5ea6\u3092\u8a55\u4fa1\u3059\u308b\u969b\u306e\u4eee\u60f3\u653b\u6483\u8005\u304c\u3068\u308b\u653b\u6483\u30e2\u30c7\u30eb\u306e\u4e00\u3064\u3067\u3001\u653b\u6483\u8005\u306f\u6697\u53f7\u6587\u306b\u306e\u307f\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u3067\u3042\u308b\u3068\u3044\u3046\u4eee\u5b9a\u306e\u3082\u3068\u3067\u884c\u308f\u308c\u308b\u3002 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function\u306a\u3069\u306e\u624b\u6cd5\u306e\u958b\u767a\u306b\u3088\u308a\u4e00\u90e8\u3067\u767a\u5c55\u304c\u898b\u3089\u308c\u305f\u3002\u305d\u308c\u3067\u3082\u306a\u304a\u3001\u8aa4\u3063\u305f\u6697\u53f7\u306e\u4f7f\u7528\u6cd5\u3084\u3001\u5ff5\u5165\u308a\u306a\u7cbe\u67fb\u304c\u884c\u308f\u308c\u3066\u3044\u306a\u3044\u81ea\u5bb6\u88fd\u306e\u6697\u53f7\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3078\u306e\u4f9d\u5b58\u306e\u305b\u3044\u3067\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u6642\u4ee3\u306e\u6697\u53f7\u30b7\u30b9\u30c6\u30e0\u306e\u4e2d\u306b\u3082\u6697\u53f7\u6587\u5358\u72ec\u653b\u6483\u306e\u5bfe\u8c61\u3068\u306a\u308b\u3082\u306e\u304c\u6570\u591a\u304f\u5b58\u5728\u3059\u308b\u3002\u4f8b\u3092\u4ee5\u4e0b\u306b\u6319\u3052\u308b\u3002 \u30de\u30a4\u30af\u30ed\u30bd\u30d5\u30c8 \u306ePPTP VPN\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3067\u306f\u3001\u9001\u4fe1\u5074\u3068\u53d7\u4fe1\u5074\u3067\u540c\u3058RC4\u30ad\u30fc\u3092\u4f7f\u7528\u3057\u3066\u3044\u305f[1]\uff08\u5f8c\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u306f\u307e\u305f\u5225\u306e\u554f\u984c\u304c\u3042\u308b\uff09\u3002\u3044\u304b\u306a\u308b\u5834\u5408\u3067\u3082\u3001RC4\u306e\u3088\u3046\u306a\u30b9\u30c8\u30ea\u30fc\u30e0\u6697\u53f7\u3067\u540c\u3058\u9375\u30922\u5ea6\u4f7f\u7528\u3059\u308c\u3070\u6697\u53f7\u6587\u5358\u72ec\u653b\u6483\u3092\u8a31\u3057\u3066\u3057\u307e\u3046\u3002\u30b9\u30c8\u30ea\u30fc\u30e0\u6697\u53f7\u653b\u6483\u3082\u53c2\u7167\u306e\u3053\u3068\u3002 Wired Equivalent Privacy(WEP)\u306f\u521d\u306eWi-Fi\u5411\u3051\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3042\u308b\u304c\u3001\u3044\u304f\u3064\u304b\u306e\u653b\u6483\u6cd5\u306b\u5bfe\u3057\u3066\u8106\u5f31\u3067\u3042\u308b\u3053\u3068\u304c\u5224\u660e\u3057\u3066\u304a\u308a\u3001\u305d\u306e\u591a\u304f\u304c\u6697\u53f7\u6587\u5358\u72ec\u653b\u6483\u3067\u3042\u308b\u3002 \u8fd1\u5e74\u8a2d\u8a08\u3055\u308c\u305f\u6697\u53f7\u306e\u4e2d\u306b\u3082\u3001\u5f8c\u306b\u6697\u53f7\u6587\u5358\u72ec\u653b\u6483\u306b\u5bfe\u3057\u3066\u8106\u5f31\u3067\u3042\u308b\u3053\u3068\u304c\u660e\u3089\u304b\u306b\u306a\u3063\u305f\u3082\u306e\u304c\u3042\u308b\u3002Akelarre\u3082\u53c2\u7167\u306e\u3053\u3068\u3002 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NT","datePublished":"2019-04-30","dateModified":"2019-04-30","author":{"@type":"Person","@id":"https:\/\/wiki.edu.vn\/jp\/wiki3\/archives\/author\/lordneo#Person","name":"lordneo","url":"https:\/\/wiki.edu.vn\/jp\/wiki3\/archives\/author\/lordneo","image":{"@type":"ImageObject","@id":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","url":"https:\/\/secure.gravatar.com\/avatar\/c9645c498c9701c88b89b8537773dd7c?s=96&d=mm&r=g","height":96,"width":96}},"publisher":{"@type":"Organization","name":"Enzyklop\u00e4die","logo":{"@type":"ImageObject","@id":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","url":"https:\/\/wiki.edu.vn\/wiki4\/wp-content\/uploads\/2023\/08\/download.jpg","width":600,"height":60}},"image":{"@type":"ImageObject","@id":"https:\/\/ja.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","url":"https:\/\/ja.wikipedia.org\/wiki\/Special:CentralAutoLogin\/start?type=1x1","height":"1","width":"1"},"url":"https:\/\/wiki.edu.vn\/jp\/wiki3\/archives\/8889","about":["Wiki"],"wordCount":396,"articleBody":"\u6697\u53f7\u6587\u5358\u72ec\u653b\u6483\uff08\u3042\u3093\u3054\u3046\u3076\u3093\u305f\u3093\u3069\u304f\u3053\u3046\u3052\u304d\u3001ciphertext-only attack\u3001COA\uff09\u307e\u305f\u306f\u65e2\u77e5\u6697\u53f7\u6587\u653b\u6483\uff08\u304d\u3061\u3042\u3093\u3054\u3046\u3076\u3093\u3053\u3046\u3052\u304d\u3001known ciphertext attack\uff09\u3068\u306f\u3001\u6697\u53f7\u7cfb (cryptosystem) \u306e\u5f37\u5ea6\u3092\u8a55\u4fa1\u3059\u308b\u969b\u306e\u4eee\u60f3\u653b\u6483\u8005\u304c\u3068\u308b\u653b\u6483\u30e2\u30c7\u30eb\u306e\u4e00\u3064\u3067\u3001\u653b\u6483\u8005\u306f\u6697\u53f7\u6587\u306b\u306e\u307f\u30a2\u30af\u30bb\u30b9\u53ef\u80fd\u3067\u3042\u308b\u3068\u3044\u3046\u4eee\u5b9a\u306e\u3082\u3068\u3067\u884c\u308f\u308c\u308b\u3002  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function\u306a\u3069\u306e\u624b\u6cd5\u306e\u958b\u767a\u306b\u3088\u308a\u4e00\u90e8\u3067\u767a\u5c55\u304c\u898b\u3089\u308c\u305f\u3002\u305d\u308c\u3067\u3082\u306a\u304a\u3001\u8aa4\u3063\u305f\u6697\u53f7\u306e\u4f7f\u7528\u6cd5\u3084\u3001\u5ff5\u5165\u308a\u306a\u7cbe\u67fb\u304c\u884c\u308f\u308c\u3066\u3044\u306a\u3044\u81ea\u5bb6\u88fd\u306e\u6697\u53f7\u30a2\u30eb\u30b4\u30ea\u30ba\u30e0\u3078\u306e\u4f9d\u5b58\u306e\u305b\u3044\u3067\u3001\u30b3\u30f3\u30d4\u30e5\u30fc\u30bf\u6642\u4ee3\u306e\u6697\u53f7\u30b7\u30b9\u30c6\u30e0\u306e\u4e2d\u306b\u3082\u6697\u53f7\u6587\u5358\u72ec\u653b\u6483\u306e\u5bfe\u8c61\u3068\u306a\u308b\u3082\u306e\u304c\u6570\u591a\u304f\u5b58\u5728\u3059\u308b\u3002\u4f8b\u3092\u4ee5\u4e0b\u306b\u6319\u3052\u308b\u3002  \u30de\u30a4\u30af\u30ed\u30bd\u30d5\u30c8 \u306ePPTP VPN\u30bd\u30d5\u30c8\u30a6\u30a7\u30a2\u3067\u306f\u3001\u9001\u4fe1\u5074\u3068\u53d7\u4fe1\u5074\u3067\u540c\u3058RC4\u30ad\u30fc\u3092\u4f7f\u7528\u3057\u3066\u3044\u305f[1]\uff08\u5f8c\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u306f\u307e\u305f\u5225\u306e\u554f\u984c\u304c\u3042\u308b\uff09\u3002\u3044\u304b\u306a\u308b\u5834\u5408\u3067\u3082\u3001RC4\u306e\u3088\u3046\u306a\u30b9\u30c8\u30ea\u30fc\u30e0\u6697\u53f7\u3067\u540c\u3058\u9375\u30922\u5ea6\u4f7f\u7528\u3059\u308c\u3070\u6697\u53f7\u6587\u5358\u72ec\u653b\u6483\u3092\u8a31\u3057\u3066\u3057\u307e\u3046\u3002\u30b9\u30c8\u30ea\u30fc\u30e0\u6697\u53f7\u653b\u6483\u3082\u53c2\u7167\u306e\u3053\u3068\u3002Wired Equivalent Privacy(WEP)\u306f\u521d\u306eWi-Fi\u5411\u3051\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u30d7\u30ed\u30c8\u30b3\u30eb\u3067\u3042\u308b\u304c\u3001\u3044\u304f\u3064\u304b\u306e\u653b\u6483\u6cd5\u306b\u5bfe\u3057\u3066\u8106\u5f31\u3067\u3042\u308b\u3053\u3068\u304c\u5224\u660e\u3057\u3066\u304a\u308a\u3001\u305d\u306e\u591a\u304f\u304c\u6697\u53f7\u6587\u5358\u72ec\u653b\u6483\u3067\u3042\u308b\u3002\u8fd1\u5e74\u8a2d\u8a08\u3055\u308c\u305f\u6697\u53f7\u306e\u4e2d\u306b\u3082\u3001\u5f8c\u306b\u6697\u53f7\u6587\u5358\u72ec\u653b\u6483\u306b\u5bfe\u3057\u3066\u8106\u5f31\u3067\u3042\u308b\u3053\u3068\u304c\u660e\u3089\u304b\u306b\u306a\u3063\u305f\u3082\u306e\u304c\u3042\u308b\u3002Akelarre\u3082\u53c2\u7167\u306e\u3053\u3068\u3002\u6697\u53f7\u306e\u9375\u7a7a\u9593\u304c\u5341\u5206\u306b\u5c0f\u3055\u3044\u5834\u5408\u3001\u6697\u53f7\u6587\u306b\u3055\u3048\u30a2\u30af\u30bb\u30b9\u3067\u304d\u308c\u3070\u3042\u3068\u306f\u5358\u7d14\u306b\u3059\u3079\u3066\u306e\u9375\u3092\u8a66\u884c\u3059\u308c\u3070\u3088\u3044\uff08\u7dcf\u5f53\u305f\u308a\u653b\u6483\uff09\u3002\u3053\u306e\u5834\u5408\u3001\u4f55\u3089\u304b\u306e\u65b9\u6cd5\u3067\u30e9\u30f3\u30c0\u30e0\u30ce\u30a4\u30ba\u3068\u6b63\u3057\u3044\u5e73\u6587\u3068\u3092\u533a\u5225\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u304c\u3001\u3053\u308c\u306f\u5e73\u6587\u304c\u81ea\u7136\u8a00\u8a9e\u3067\u3001\u304b\u3064\u6697\u53f7\u6587\u306e\u9577\u3055\u304c\u5224\u5225\u8ddd\u96e2\u3088\u308a\u9577\u3051\u308c\u3070\u5bb9\u6613\u306b\u884c\u3048\u308b\u3002\u4f8b\u3068\u3057\u3066\u306fDES\u304c\u3042\u308a\u3001\u3053\u308c\u306f\u9375\u306e\u9577\u3055\u304c56\u30d3\u30c3\u30c8\u3057\u304b\u306a\u3044\u3002\u307e\u305f\u3088\u304f\u3042\u308b\u30b1\u30fc\u30b9\u3068\u3057\u3066\u306f\u3001\u5546\u7528\u306e\u30bb\u30ad\u30e5\u30ea\u30c6\u30a3\u88fd\u54c1\u306b\u304a\u3044\u3066\u3001\u6697\u53f7\u9375\u306e\u4f5c\u6210\u306bAES\u306e\u3088\u3046\u306a\u5805\u56fa\u306a\u65b9\u6cd5\u3067\u306f\u306a\u304f\u30e6\u30fc\u30b6\u306e\u5165\u529b\u3057\u305f\u30d1\u30b9\u30ef\u30fc\u30c9\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u3082\u306e\u304c\u3042\u308b\uff08\u4f8b\u3048\u3070\u3001Windows NT 4.0\u306ePPTP\u306b\u304a\u3044\u3066\u3001\u30bb\u30c3\u30b7\u30e7\u30f3\u30ad\u30fc\u306f\u30e6\u30fc\u30b6\u306e\u5165\u529b\u3057\u305f\u30d1\u30b9\u30ef\u30fc\u30c9\u304b\u3089\u751f\u6210\u3055\u308c\u308b[2]\uff09\u3002\u30e6\u30fc\u30b6\u306e\u5165\u529b\u3057\u305f\u30d1\u30b9\u30ef\u30fc\u30c9\u304c\u6697\u53f7\u306e\u9375\u7a7a\u9593\u3068\u540c\u7a0b\u5ea6\u306e\u60c5\u5831\u30a8\u30f3\u30c8\u30ed\u30d4\u30fc\u3092\u6301\u3063\u3066\u3044\u308b\u3053\u3068\u306f\u7a00\u3067\u3042\u308b\u305f\u3081\u3001\u305d\u306e\u3088\u3046\u306a\u6697\u53f7\u306f\u3053\u306e\u65b9\u6cd5\u3067\u7a81\u7834\u3067\u304d\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308b\u3002DVD\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u308bCSS\u6697\u53f7\u306f\u9375\u306e\u9577\u3055\u304c40\u30d3\u30c3\u30c8\u3057\u304b\u306a\u3044\u305f\u3081\u3001MPEG-2\u306e\u30c7\u30fc\u30bf\u306b\u3055\u3048\u30a2\u30af\u30bb\u30b9\u51fa\u6765\u308c\u3070\u5f8c\u306f\u3053\u306e\u65b9\u6cd5\u3060\u3051\u3067\u7a81\u7834\u304c\u53ef\u80fd\u3067\u3042\u308b\u3002\u53c2\u8003\u6587\u732e[\u7de8\u96c6]^ Bruce Schneier, Cryptanalysis of Microsoft’s PPTP Authentication Extensions (MS-CHAPv2), October 19 1999.^ \u201cUnderstanding PPTP (Windows NT 4.0)\u201d.   Microsoft. 2011\u5e7412\u670825\u65e5\u95b2\u89a7\u3002\u00a0\u201cThe RSA RC4 standard is used to create this 40-bit session key based on the client password.\u201dAlex Biryukov and Eyal Kushilevitz, From Differential Cryptanalysis to Ciphertext-Only Attacks, CRYPTO 1998, pp72-88;\u95a2\u9023\u9805\u76ee[\u7de8\u96c6]"},{"@context":"http:\/\/schema.org\/","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"item":{"@id":"https:\/\/wiki.edu.vn\/jp\/wiki3\/#breadcrumbitem","name":"Enzyklop\u00e4die"}},{"@type":"ListItem","position":2,"item":{"@id":"https:\/\/wiki.edu.vn\/jp\/wiki3\/archives\/8889#breadcrumbitem","name":"\u6697\u53f7\u6587\u5358\u72ec\u653b\u6483 – Wikipedia"}}]}]