[B! Security][Algorithm] clavierã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯

clavier id:clavier

Securityã¨Algorithmã«é–¢ã™ã‚‹clavierã®ãƒ–ãƒƒã‚¯ãƒžãƒ¼ã‚¯ (7)

${{author_name}}$

{{{comment_expanded}}}

{{label}}

{{#is_bookmark}}ãƒªã‚¹ãƒˆ{{/is_bookmark}}{{^is_bookmark}}ãƒªãƒ³ã‚¯{{/is_bookmark}}

${{author_name}}$
{{author_name}}{{created}}
{{ #comment }}{{ comment }}{{ /comment }}
- {{ label }}

${{author_name}}$

{{{comment_expanded}}}

{{label}}

{{#is_bookmark}}ãƒªã‚¹ãƒˆ{{/is_bookmark}}{{^is_bookmark}}ãƒªãƒ³ã‚¯{{/is_bookmark}}

ãƒžã‚¤ãƒŠãƒ³ãƒãƒ¼ã®ãƒã‚§ãƒƒã‚¯ãƒ‡ã‚¸ãƒƒãƒˆãŒã‹ãªã‚Šæ¥ãšã‹ã—ã„ä»¶ã«ã¤ã„ã¦ - CSS2017ã‚ãƒ£ãƒ³ãƒ‰ãƒ«ã‚¹ã‚¿ãƒ¼ã‚»ãƒƒã‚·ãƒ§ãƒ³
6. å…·ä½“ä¾‹ ç¶¾é·¹500ï½ï½Œã®JANã‚³ãƒ¼ãƒ‰ â†“ 82 mod 10 = 2 Ã— Ã— Code 4 9 0 2 1 0 2 1 0 7 6 4 8 é‡ã¿ 1 3 1 3 1 3 1 3 1 3 1 3 ä¹—ç®— 4 27 0 6 1 0 2 3 0 21 6 12 åˆè¨ˆ 82 Ã— Ã— Ã— Ã— Ã— Ã— Ã— Ã— Ã— Ã— Ã— Ã— â†“ â†“ â†“ â†“ â†“ â†“ â†“ â†“ â†“ â†“ â†“ â†“ 8. Verhoeffã«ã‚ˆã‚‹èª¿æŸ»ï¼ˆéƒµä¾¿ç•ªå·ï¼‰ èª¤ã‚Š æ¡æ•° èª¤ã‚Šã®ç¨® é¡ž èª¤ã‚Šæ•° é »åº¦ 1 å˜ç´”èª¤ã‚Š 9,574 79.05% 2 å…¥æ›¿ 1,237 10.21% åŒå (aaâ†’bb) 67 0.55% ä¼¼ãŸéŸ³ (1aâ†’a0) 59 0.49% ãã®ä»–ã® 2æ¡ 232 1.92% é£›ã³è¶Šã— å…¥æ›¿ 99 0.82% é£›ã³è¶Šã— åŒå 35 0.29% ä»–ã®é£›ã³ è¶Šã—èª¤ã‚Š 43 0.36% ãã®ä»– 98 0.81% 3 169 1.40
clavier 2017/10/25
algorithm

security

math
ãƒªãƒ³ã‚¯
ä¹±æ•°ã®æ€§è³ªã¨ã‚»ãƒƒã‚·ãƒ§ãƒ³ãƒˆãƒ¼ã‚¯ãƒ³ã®ä½œæˆ - $shibayu36->blog;
ãƒ¦ãƒ¼ã‚¶ã‚¢ã‚«ã‚¦ãƒ³ãƒˆã®ãƒã‚°ã‚¤ãƒ³æ©Ÿèƒ½ã¨ã‹ä½œã£ã¦ã‚‹ã¨ã€ä½•ã‚‰ã‹ã®å½¢ã§ã‚»ãƒƒã‚·ãƒ§ãƒ³ç”¨ã®ãƒˆãƒ¼ã‚¯ãƒ³ã‚’ä½œæˆã™ã‚‹æ©Ÿä¼šãŒã‚ã‚‹ã€‚ä»Šã¾ã§ã¯ã“ã‚Œã¯é©å½“ã«ãƒ©ãƒ³ãƒ€ãƒ ãªå€¤ã‚’åˆ©ç”¨ã—ã¦ã„ã‚Œã°ã„ã„ã‚“ã§ã—ã‚‡ã¨æ€ã£ã¦ã„ãŸã®ã ã‘ã©ã€ã¡ã‚‡ã£ã¨é•ã£ãŸã®ã§ãƒ¡ãƒ¢ã€‚ ä¹±æ•°ã®æ€§è³ª http://akademeia.info/index.php?%CD%F0%BF%F4ã«ã‚ˆã‚‹ã¨ã€ä¹±æ•°ã«ã¯ä¸‰ã¤ã®æ€§è³ªãŒã‚ã‚‹ã€‚ ç„¡ä½œç‚ºæ€§ï¼šçµ±è¨ˆçš„ãªåã‚ŠãŒãªãã€ã§ãŸã‚‰ã‚ãªæ•°åˆ—ã«ãªã£ã¦ã„ã‚‹ã¨ã„ã†æ€§è³ªã€‚ äºˆæ¸¬ä¸å¯èƒ½æ€§ï¼šéŽåŽ»ã®æ•°åˆ—ã‹ã‚‰æ¬¡ã®æ•°ã‚’äºˆæ¸¬ã§ããªã„ã¨ã„ã†æ€§è³ªã€‚ å†ç¾ä¸å¯èƒ½æ€§ï¼šåŒã˜æ•°åˆ—ã‚’å†ç¾ã§ããªã„ã¨ã„ã†æ€§è³ªã€‚å†ç¾ã™ã‚‹ãŸã‚ã«ã¯ã€æ•°åˆ—ãã®ã‚‚ã®ã‚’ä¿å˜ã—ã¦ãŠãã—ã‹ãªã„ã€‚ ã“ã®æ™‚ã€å°‘ãªãã¨ã‚‚ç„¡ä½œç‚ºæ€§ã®ã¿æº€ãŸã•ã‚Œã¦ã„ã‚‹ã¨å¼±ã„æ“¬ä¼¼ä¹±æ•°ã€ç„¡ä½œç‚ºæ€§ã¨äºˆæ¸¬ä¸å¯èƒ½æ€§ãŒæº€ãŸã•ã‚Œã¦ã„ã‚‹ã¨å¼·ã„æ“¬ä¼¼ä¹±æ•°ã€å…¨ã¦ãŒæº€ãŸã•ã‚Œã¦ã„ã‚Œã°çœŸã®ä¹±æ•°ã¨å‘¼ã°ã‚Œã‚‹ã€‚ã‚½ãƒ•ãƒˆã‚¦ã‚§ã‚¢ã ã‘ã§ã¯ã€çœŸã®ä¹±æ•°ã‚’ä½œã‚‹ã“ã¨ãŒã§ããšã€çœŸã®ä¹±æ•°ã«
clavier 2015/10/26
security

Algorithm

perl
ãƒªãƒ³ã‚¯
RFC6238 Time-based One-time Password Algorithm (TOTP)ã®ä»•çµ„ã¿ã®ãƒ¡ãƒ¢ - Qiita
RFCã¯ã“ã‚Œã€‚Javaã§ã®å®Ÿè£…ä¾‹ã‚‚ã‚¢ãƒª: RFC 6238 - TOTP: Time-Based One-Time Password Algorithm RFCã‚‚ååˆ†çŸã„ã‘ã©ã€Wikipediaã®ã»ã†ã¯ã•ã‚‰ã«ç°¡æ½”: Time-based One-time Password Algorithm - Wikipedia, the free encyclopedia æ—¥æœ¬èªžã§ã®å‚ç…§æƒ…å ±: Googleã®2æ®µéšŽèªè¨¼ã§ä½¿ã‚ã‚Œã¦ã„ã‚‹OTPã®ä»•æ§˜ãŒæ°—ã«ãªã£ãŸ - r-weblife RFCã«æ›¸ã„ã¦ã‚ã‚‹å®Ÿè£…ä½¿ã†ã¨ã‹ã§ã‚µã‚¯ãƒƒã¨ãƒ¯ãƒ³ã‚¿ã‚¤ãƒ ãƒ‘ã‚¹ãƒ¯ãƒ¼ãƒ‰ã‚’ç”Ÿæˆã§ãã‚‹ã®ã§ã€ã‚‚ã£ã¨æ™®åŠã™ã‚‹ã¨ã„ã„ã§ã™ãã€‚ãã®å ´åˆã¯ã‚·ãƒ¼ã‚¯ãƒ¬ãƒƒãƒˆã®æ‰±ã„ã¯é©åˆ‡ã«ãŠé¡˜ã„ã—ã¾ã™ã€‚ èªè¨¼ã®æ¦‚è¦ ã‚µãƒ¼ãƒãƒ¼ã¨å…±æœ‰ã—ã¦ã„ã‚‹ã‚·ãƒ¼ã‚¯ãƒ¬ãƒƒãƒˆã‚ãƒ¼ã¨ç¾åœ¨æ™‚åˆ»ã‹ã‚‰ãƒãƒƒã‚·ãƒ¥ã‚’ç”Ÿæˆã—ã¦ãã‚ŒãŒåˆã£ã¦ã‚‹ã‹ã‚’ã¿ã‚‹ã€ã¨ã„ã†ã®ãŒå¤§ç‹ã®æµã‚Œã€‚ ãƒ¯ãƒ³ã‚¿ã‚¤ãƒ ãƒ‘ã‚¹ãƒ¯ãƒ¼ãƒ‰ã®ç”Ÿæˆ Wikip
clavier 2015/10/25
algorithm

security
ãƒªãƒ³ã‚¯
æš—å·ã«ä½¿ãˆã‚‹ä¹±æ•°ã¨ä½¿ãˆãªã„ä¹±æ•°
ã¾ãšé‡è¦ãªãƒã‚¤ãƒ³ãƒˆã¨ã—ã¦ã€æ“¬ä¼¼ä¹±æ•°ã®ã‚·ãƒ¼ãƒ‰ã¨ãªã‚‹çœŸã®ä¹±æ•° (è³ªå•ã®å ´åˆã¯å††å‘¨çŽ‡ã®ã»ã†ã§ã¯N, æ¼¸åŒ–å¼ã®æ–¹ã§ã¯M) ã¯ååˆ†ã«åºƒã„ç©ºé–“ã‹ã‚‰ãƒ©ãƒ³ãƒ€ãƒ ã«é¸ã°ã‚Œãªãã¦ã¯ãªã‚Šã¾ã›ã‚“ã€‚ ã©ã‚“ãªæ“¬ä¼¼ä¹±æ•°ç”Ÿæˆå™¨ã‚’ä½¿ã£ã¦ã„ãŸã¨ã—ã¦ã‚‚ã‚·ãƒ¼ãƒ‰ãŒé«˜ã€…1å„„ç¨‹åº¦ã§ã¯ç·å½“ãŸã‚Šã§(æ¯”è¼ƒçš„)ç°¡å˜ã«ã‚·ãƒ¼ãƒ‰ãŒã¿ã¤ã‹ã£ã¦ã—ã¾ã„ç”Ÿæˆã•ã‚Œã‚‹ä¹±æ•°ãŒå†ç¾ã§ãã¦ã—ã¾ã„ã¾ã™ã€‚ å††å‘¨çŽ‡ã®å…ˆé 100ä¸‡æ¡ã®ã©ã“ã‹ã‹ã‚‰é¸ã¶ãªã©ã¯å•é¡Œå¤–ã§ã™ã€‚ ã‚·ãƒ¼ãƒ‰ã¯RSA/DSAãªã©ã®éµé•·ã«åˆã‚ã›ã¦ 1000 bit ç¨‹åº¦ (10é€²æ•°ã§300æ¡ç¨‹åº¦) ã¯æ¬²ã—ã„ã‹ã¨æ€ã„ã¾ã™ã€‚ è³ªå•ã«ã‚ã‚‹å††å‘¨çŽ‡ã‚’æ“¬ä¼¼ä¹±æ•°ã¨ã—ã¦ä½¿ã†æ–¹æ³•ã§ã™ãŒã€å††å‘¨çŽ‡ã® Næ¡ç›®ã‹ã‚‰ã®æ•°åˆ—ãŒã‚ã‚‹é•·ã•ä¸Žãˆã‚‰ã‚ŒãŸæ™‚ã« N è‡ªä½“ã‚’é€†ç®—ã—ãŸã‚Š, æ¬¡ã®å‡ºåŠ›ã‚’æŽ¨æ¸¬ã™ã‚‹é«˜é€Ÿãª (Nã®ãƒ“ãƒƒãƒˆæ•°ã®å¤šé …å¼æ™‚é–“ã§å®Ÿè¡Œå¯èƒ½ãª) ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ã¯çŸ¥ã‚‰ã‚Œã¦ã„ãªã„ã‹ã¨æ€ã„ã¾ã™ã€‚ ãã®ãŸã‚ N ãŒååˆ†ã«å¤§ãã‘ã‚Œã°ã‚ã‚‹æ™‚ç‚¹ã¾ã§ã®å‡ºåŠ›ãŒæ”»æ’ƒè€…ã«
clavier 2015/01/06
algorithm

security
ãƒªãƒ³ã‚¯
Hash-flooding DoS ã¨ SipHash - ã‚ã©ã‘ãªã„è©±
ä»¥å‰ã€åƒ•ãŒå®Ÿè£…ã—ã¦ã„ã‚‹ web ã‚µãƒ¼ãƒ Mighty ãŒã€Haskell ã§æ›¸ã„ã¦ã„ã‚‹ã«ã‚‚é–¢ã‚ã‚‰ãšã€ã‚»ã‚°ãƒ¡ãƒ³ãƒ†ãƒ¼ã‚·ãƒ§ãƒ³ãƒ•ã‚©ãƒ¼ãƒ«ãƒˆã‚’èµ·ã“ã—ã¦ã„ãŸã€‚èª¿ã¹ãŸã¨ã“ã‚ hashable ãƒ©ã‚¤ãƒ–ãƒ©ãƒªãŒãƒªãƒ³ã‚¯ã™ã‚‹ C ã® DJBX33X ãŒã€SipHash ã«å¤‰ã‚ã£ãŸã“ã¨ãŒåŽŸå› ã ã£ãŸã€‚ã“ã®ã¨ãã‹ã‚‰ SipHash ãŒæ°—ã«ãªã£ã¦ã„ãŸã—ã€ä»¥å‰ç¤¾å†…ã§èª¬æ˜Žã—ãŸ "Efficient Denial of Service Attacks" ã¨ã®é–¢ä¿‚ã‚‚çŸ¥ã‚ŠãŸã‹ã£ãŸã®ã§ã€å°‘ã—èª¿ã¹ã¦ã¿ãŸã€‚ã“ã®è¨˜äº‹ã¯ã€ãã®è¦šãˆæ›¸ãã€‚ Hash-flooding DoS ã®æ´å² 1998 å¹´ã« Alexander Peslyak æ°ãŒ Phrack Magazine ã§ã€Hash-flooding DoS ã‚’å—ã‘ãŸã“ã¨ã‚’å ±å‘Šã—ã¦ã„ã‚‹ã€‚ãƒãƒƒã‚·ãƒ¥ã¯ã€N å€‹ã®è¦ç´ ã‚’æŒ¿å…¥ã™ã‚‹ã®ã«é€šå¸¸ O(N) ã‹ã‹ã‚‹ãŒã€ãƒãƒƒã‚·ãƒ¥å€¤ãŒã™ã¹ã¦è¡çªã™ã‚‹æœ€æ‚ªã®å ´åˆã§ã¯ O
clavier 2013/12/09
security

algorithm
ãƒªãƒ³ã‚¯
PHP5.4.8ã¾ã§ã«hashdosæ”»æ’ƒã®å±é™ºæ€§?
å¾³ä¸¸ æµ© @ockeghem PHP5.4.9ãƒªãƒªãƒ¼ã‚¹â€¦ã€Žmax_input_vars doesn't filter variables when mbstring.encoding_translation = Onã€â†ã’ã£ã€ã“ã‚“ãªãƒã‚°ãŒã‚ã£ãŸã®ã‹ï¼ˆè¦ç¢ºèªï¼‰ http://t.co/K8iEBeg2 2012-11-23 11:52:34
clavier 2012/11/23
security

algorithm

php
ãƒªãƒ³ã‚¯
NTTã€æš—å·ã‚¢ãƒ«ã‚´ãƒªã‚ºãƒ ã€ŒCamelliaã€ã®ã‚½ãƒ¼ã‚¹ã‚³ãƒ¼ãƒ‰ã‚’å…¬é–‹
Windows SQL Server 2005ã‚µãƒãƒ¼ãƒˆçµ‚äº†ã®4æœˆ12æ—¥ãŒè¿«ã‚‹ã€å ±å‘Šæ¸ˆã¿è„†å¼±æ€§ã®æ·±åˆ»åº¦ã‚‚é«˜ãã€æ—©æ€¥ãªç§»è¡Œã‚’
clavier 2006/04/15
algorithm

security

oss

source
ãƒªãƒ³ã‚¯
1