Key schedule - Wikipedia
This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Key schedule" – news · newspapers · books · scholar · JSTOR (July 2008) (Learn how and when to remove this message) The key schedule of DES ("<<<" denotes a left rotation), showing the calculation of eac
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WebCrypto Key Discovery
WebCrypto Key Discovery W3C Working Group Note 29 March 2016 This version: http://www.w3.org/TR/2016/NOTE-webcrypto-key-discovery-20160329/ Latest published version: http://www.w3.org/TR/webcrypto-key-discovery/ Latest editor's draft: http://dvcs.w3.org/hg/webcrypto-keydiscovery/raw-file/tip/Overview.html Previous version: http://www.w3.org/TR/2013/WD-webcrypto-key-discovery-20130822/ Editor: Mark
First Web Crypto implementations : expecting your imagination to play with !
Being chair of a W3C Working Group puts you in a nice situation that you are aware of any brand new implementations of the specifications your working group is supposed to design. In the case of the Web Crypto WG, I must confess I am quite lucky : the group has started one year ago, the first public working drafts were fired 10 months ago, last call is planned for October (planned, I said, no bloo
GitHub - tonyg/js-nacl: Pure-Javascript High-level API to Emscripten-compiled libsodium routines.
A high-level Javascript API wrapping an Emscripten-compiled libsodium, a cryptographic library based on NaCl. Includes both in-browser and node.js support. The paper "The security impact of a new cryptographic library" is an excellent summary of the motivation behind the NaCl API and library design. Using this library in the browser requires support for the newish window.crypto.getRandomValues API
疑似乱数 - 186 @ hatenablog
ã¡ã‚‡ã£ã¨ã—ãŸæ€ã„ã¤ã。 疑似乱数列を生æˆã™ã‚‹è¨ˆç®—方法ã®å¦¥å½“性を調ã¹ã‚‹ã®ã«ãƒãƒ¥ãƒ¼ãƒªãƒ³ã‚°ãƒ†ã‚¹ãƒˆçš„方法ã¯ä½¿ãˆã‚‹ã‹ã€‚ 放射線ãªã©ã‚’用ã„ãŸçœŸã®ä¹±æ•°åˆ—ã¨ã€èª¿æŸ»ã—ãŸã„計算方法ã®ç”Ÿæˆã™ã‚‹ç–‘似乱数列ã¨ãŒã€äºŒã¤ã®ãƒãƒ£ãƒãƒ«A, Bã‹ã‚‰æµã‚Œå‡ºã¦ãる。ã§ã‚‚ã©ã¡ã‚‰ã®æ•°åˆ—ãŒã©ã¡ã‚‰ã®ãƒãƒ£ãƒãƒ«ã‹ã‚‰æµã‚Œã¦ãã‚‹ã‹ã¯åˆ†ã‹ã‚‰ãªã„ã¨ã™ã‚‹ã€‚乱数を検定ã™ã‚‹ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ を別途用æ„ã—ã¦ãŠãã€äºŒã¤ã®ãƒãƒ£ãƒãƒ«ã®ã©ã¡ã‚‰ãŒçœŸã®ä¹±æ•°åˆ—ã§ã‚ã‚‹ã‹åˆ¤å®šã§ãã‚‹ã‹ã€‚ ――ã¨ã„ã†è©±é¡Œã€‚ ãã‚ŒãŒã§ãã‚‹ãªã‚‰ã€ãƒ©ãƒ³ãƒ€ãƒ ãƒã‚¹ã¨çŸ¥èƒ½ã¨ã®é¡žä¼¼æ€§ã¨ã„ã†é€†èª¬çš„ã§é¢ç™½ã„話題ã«ã¤ãªãŒã‚‹ã。 ãƒãƒ¥ãƒ¼ãƒªãƒ³ã‚°ãƒ†ã‚¹ãƒˆã§ã¯ã€æœ¬ç‰©ã®äººé–“ã¨é©åˆ‡ãªåˆ¤å®šè€…ã«ã‚ˆã£ã¦ã€ã‚³ãƒ³ãƒ”ュータã®ãƒ—ãƒã‚°ãƒ©ãƒ ã®çŸ¥èƒ½æ€§(?)を判定ã™ã‚‹ï¼ˆè¨€ã„æ›ãˆã‚‹ã¨ãれを知能ã®å®šç¾©ã¨ã™ã‚‹ï¼‰ã€‚上ã«æ›¸ã„ãŸãƒ†ã‚¹ãƒˆã§ã¯ã€çœŸã®ä¹±æ•°åˆ—（本物ã®äººé–“ã®ä»£ã‚り）ã¨æ¤œå®šã‚’ã™ã‚‹ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ （é©åˆ‡ãªåˆ¤å®šè€…ã®ä»£ã‚り）ã«ã‚ˆã£ã¦ã€ 疑似乱数列ã®è¨ˆç®—方法ã®å¦¥å½“性を判定ã™
Key Derivation Functions: How many KDFs are there?
Glossary KDFkey derivation function PBKDFpassword-based key derivation function MGFmask generation function PRFpseudo-random function PRBGpseudo-random byte generator HMACkeyed-hash message authentication code Hasha cryptographically-secure message digest hash function Notation and Conventions In this page, all byte encodings are represented in hex and all lengths are defined in bytes (octets). N
パスワードã®ãƒãƒƒã‚·ãƒ¥ã«ä½¿ã†ã¹ãPBKDF2ã€Bcryptã€HMACã®å„言語実装一覧 - ã“ã®ãƒ–ãƒã‚°ã¯URLãŒå¤‰æ›´ã«ãªã‚Šã¾ã—ãŸ
ã„ã¤ã‚‚忘れるã®ã§ãƒ¡ãƒ¢ã€‚ å…ƒãƒã‚¿:Are you sure SHA-1+salt is enough for passwords? 日本語訳:「SHA-1+saltã€ã¯ãƒ‘スワードã«å分ã ã¨æ€ã„ã¾ã™ã‹ï¼Ÿ ã“ã†ã—ãŸã‚¹ã‚ームをã„ãã¤ã‹é¸ã¶ã“ã¨ãŒã§ãる： PBKDF2 http://en.wikipedia.org/wiki/PBKDF2 Bcrypt http://www.openwall.com/crypt/ HMAC http://en.wikipedia.org/wiki/HMAC å„é¸æŠžè‚¢ã¯ãã‚Œãžã‚Œã®å¼·ã¿ã¨å¼±ã¿ãŒã‚ã‚‹ãŒã€ã“れらã¯å…¨ã¦SHA1+saltã®ã‚ˆã†ãªæ±Žç”¨ãƒãƒƒã‚·ãƒ¥ã®ã‚¤ãƒ³ãƒ—リメンテーションよりã€ã¯ã‚‹ã‹ã«å¼·åŠ›ã 。 ã¨ã„ã†ã“ã¨ã§ã€å„言語ã§ã®å®Ÿè£…を調ã¹ã¦ã¿ãŸã€‚実装ãŒæ£ã—ã„ã‹ã¯èª¿ã¹ã¦ãªã„。別実装もã‚ã‚‹ã‹ã‚‚ã—ã‚Œãªã„。 言語 PBKDF2 Bcrypt HMAC Java Bouncy Castl
Fully homomorphic encryption 完全準åŒåž‹æš—å·ã®æµã‚Œã¨ã‹ - 晴ノート
æ´å² 最近ã€è©±é¡Œã®å®Œå…¨æº–åŒåž‹æš—å·ã ãŒã€åˆå‡ºã¯ã‹ãªã‚Šå¤ã„[Rivext 1978]。RSAæš—å·ã®ç™ºè¦‹ãŒ1977å¹´ã ã‹ã‚‰ã€ç¾ä»£æš—å·ã®æ›™ã¨ã»ã¼åŒæ™‚期ã§ã‚る。ã¨ã„ã†ã‹ã€ã“ã®è«–文もRSAæš—å·ã®Rã¨Aã®äººãŒã„る。ã¨ã‚‚ã‹ãã€ã“ã“ã§ã¯privacy homomorphismã¨å‘¼ã°ã‚Œã¦ã„ãŸã€‚ã“ã®ã¨ãã®èˆˆå‘³ã¯ç¾¤æº–åŒåž‹æ€§ã‚’æŒã¤æš—å·ãŒå˜åœ¨ã—ã¦ã„ã‚‹ãŒã€ã‚‚ã†1ã¤ã®æ¼”ç®—ã‚’åŠ ãˆãŸã‚ˆã†ãªæš—å·ã‚¹ã‚ームãŒã‚ã‚‹ã‹ã€ã¨ã„ã†ã“ã¨ã ã‚ã†ã€‚RSAã¯å¹³æ–‡ã®æŽ›ã‘ç®—ã‚’æš—å·æ–‡ã‹ã‚‰æ±‚ã‚ã‚‹ã“ã¨ãŒã§ãã€ãã‚Œãªã‚‰ã°åŠ ãˆã¦è¶³ã—ç®—ã‚‚ã§ãるよã†ãªæš—å·ã‚¹ã‚ームãŒã‚ã‚‹ã‹ã€ã¨ã„ã†ç–‘å•ã«ã„ãŸã‚‹ã®ã¯ã„ãŸã£ã¦è‡ªç„¶ã§ã‚ã£ãŸã€‚ãŒã€çµå±€è¶³ã—ç®—ã®ã¿ã§ãã‚‹ã¨ã„ã†ã‚‚ã®ã¯è¦‹ã¤ã‹ã£ã¦ã‚‚ã€ä¸¡æ–¹åŒæ™‚ã«ã§ãる方法ã¯é•·ã‚‰ã見ã¤ã‹ã£ã¦ã„ãªã‹ã£ãŸã€‚ ã“ã“ã§ç™ºæƒ³ã‚’転æ›ã—よã†ã€‚整数上ã§è¶³ã—算も掛ã‘ç®—ã‚‚ã§ãã‚‹ã¨ã„ã†ã“ã¨ã¯ã€ãƒãƒ¥ãƒ¼ãƒªãƒ³ã‚°ãƒžã‚·ãƒ³ã‚’構æˆã§ãã‚‹ã¨ã„ã†ã“ã¨ã§ã‚る。ãªãœãªã‚‰ã°ã€F2ã§ã®è¶³ã—ç®—ã¯æŽ’ä»–çš„
Gentryæš—å·ã®ç°¡å˜ãªè§£èª¬ - 186 @ hatenablog
抽象的ãªã“ã¨ã—ã‹æ›¸ãã¾ã›ã‚“. 詳ã—ã„ã“ã¨ã¯ACMã«$10払ã†ã‹ãƒ•ãƒ«ãƒ´ã‚¡ãƒ¼ã‚¸ãƒ§ãƒ³ã‚’å¾…ã¤ã‹ã—ã¾ã—ょã†. Gentryã®è«–æ–‡ã¯æ ¼åã®èª¬æ˜ŽãŒç„¡ãåˆå¦è€…ã«åŽ³ã—ã„ã®ã§, ãã®éƒ¨åˆ†ã‚’補ã†ãŸã‚ã®ãƒŽãƒ¼ãƒˆã«ä½¿ã£ã¦ãã ã•ã„. ãŸã ã—線形代数ã¨å¤šé …å¼ç’°ã®çŸ¥è˜ã¯ä»®å®šã—ã¾ã™. (ã¨ã„ã£ã¦ã‚‚å¦éƒ¨ã§ç¿’ã†åŸºæœ¬ã—ã‹ä½¿ã„ã¾ã›ã‚“.) æš—å·æ–¹å¼ãŒ3ã¤å‡ºã¦ãã¾ã™ãŒ, 最åˆã®1ã¤ã ã‘æ°—æŒã¡ã‚’ä¼ãˆã¾ã™. fを整数係数モニックãªnæ¬¡å¤šé …å¼ã¨ã—ã¦ç’°R=Z[x]/f(x)を考ãˆã¦ãã ã•ã„. å’Œã¨ç©ã¯Z[x]上ã§è¨ˆç®—ã—ã¦f(x)ã§å‰°ä½™ã‚’å–ã‚Œã°è‰¯ã„ã§ã™. æ›´ã«ã“ã®ç’°ã®ã‚¤ãƒ‡ã‚¢ãƒ«Iã‚’1ã¤æŒã£ã¦ãã¾ã™. é¢å€’ã ã£ãŸã‚‰I=(2)ã¨ã‹è€ƒãˆã¨ã„ã¦ãã ã•ã„. Rã¨IãŒå…±é€šãƒ‘ラメータã§ã™. 公開éµã¯Iã¨äº’ç´ ãªã‚¤ãƒ‡ã‚¢ãƒ«Jã®æªã‚“ã 基底Hã§ã™. 秘密éµã¯ã“ã®Jã®ç¶ºéº—ãªåŸºåº•Bã§ã™. æš—å·æ–‡ã¯ã‚³ã‚»ãƒƒãƒˆ m + I ã®è¦ç´ m + i を考ãˆã¦, c = m + i mod
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