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MD5ã§æå·åãããæååã解èªãã¦å ã«æ»ãã¾ããããã¾ã§ã復å·åãã§ã¯ãªãã解èªãã§ãã復å·åããã¢ã«ã´ãªãºã ã¯åå¨ããªããããã®ã§ã é¢ç½ãã®ããã¡ãã®ããæ¹ã no title ãã¾ãæå¿ããªãç¨éã ã¨ã¯æããã¾ãããMD5 Hash å¤ãéå¤æããããã¨æã£ã¦ã人ã«æå ±ã§ããHash å¤ã Google ã§æ¤ç´¢ãã¦ã¿ã¦ãã ãããçµæ§ãªç¢ºçã§ããããããããªãã¤ã£ã¦ã Salt ç¡ãã®å ´åã ãã§ããã©ã æ®éã ã£ããå¼·åãªã³ã³ãã¥ã¼ã¿ãã¯ã¼ã使ã£ã¦è¾æ¸æ»æããããã¨ãã§ãå½¼ãæåã¯ããããããããã§ãããããã«å«æ°ãããã¦ãhash å¤ããã®ã¾ã¾ Google ã§æ¤ç´¢ãã¦ã¿ããã ãããªãé ãããªããããããè¦äºã«å¼ã£ããã£ã! ãããä½ä»¶ã! 種ãæããã¨ãåèªãMD5ã§hashåããå¤ãURIã®ä¸é¨ã«ä½¿ããã㪠CMS ããã£ãã¼ãããã ããã§ããã¤ã¾ããä¸çä¸ã§ãããã CMS
ã2009/01/27 追è¨ã ãã®ã¨ã³ããªã¯ééã£ã¦ããã®ã§ã次ã®ã¨ã³ããªãä½µãã¦ã覧ãã ããã [PHP]ãã¹ã¯ã¼ãã®ããã·ã¥åã«ã¯crypt ã使ã£ã¦ã¯ãããªã ãã¹ã¯ã¼ããDBã«ä¿ç®¡ããã¨ãããã¬ã¼ã³ããã¹ãã®ã¾ã¾ãããã¡ã£ã¦ã®ã¯ããããããã (åè)ããã°ãç¶ããªããã | ãã¹ã¯ã¼ããå¹³æã§ç®¡çããã®ã¯ãã¡ã ã§ããã®ã¨ãã©ããã£ã¦ããã·ã¥åãããã¨ããã話ã ã¾ãã大åæã¨ãã¦å¾©å·å¯è½ãªæå·ã¯é¿ããæ¹ãããããã¹ã¯ã¼ãã復å·ããªããã°ãªããªãã¨ããã·ã¼ã³ã¯ã»ã¨ãã©ãªãã®ã§ãããã§ããã°å¾©å·ã§ããªãæ¹ãã»ãã¥ãªãã£ä¸å®å ¨ã ããã ã復å·ã§ããªãæ¹å¼ã§ããã·ã¥åããã°ãããã誰ã«ããã¹ã¯ã¼ãã¯ããããªãç¶æ ã«ãªããããã ããæ¹ã¨ãã¦ãããã¡ãªã®ã¯MD5 ã«ããããã·ã¥å $pass = 'my password'; $pass_hash = md5($password); //
ååã®ã¨ã³ããª(ãã¹ã¯ã¼ããå¹³æã§ç®¡çããã®ã¯ãã¡ã )ã®ãã¯ãã³ã¡ã³ãã§Yappoããããè²´éãªæ å ±ãé ããã MD5ã復å·ã§ããã¨ããã®ã ã ãããããããã§ããDigest::MD5::Reverseã¨ããCPANã¢ã¸ã¥ã¼ã«ãããã¨ããã ããã«ã¯é©ããããããããªæ å ±ãå½ãã£ãã¨ããããã¯ãMD5ãªã©ã®ããã·ã¥ã¯å¾©å·ã§ããªãã¨æ¸ãã¦ããããã ã http://www5f.biglobe.ne.jp/~h-it/mlcont/mc0200.htm http://gimite.net/bcbqtree/qtreemain.cgi?mode=thread&thread=376 http://www.postgresql.jp/document/pg803doc/html/encryption-options.html ããããããããã¨ããã§ããã復å·ã§ããªããã¨ããã®ã¯ã復å·ããã¢ã«ã´ãª
Apache ã® htpasswd ã§ä½ããã¹ã¯ã¼ãã®ãã¤ã¸ã§ã¹ãã¨åããã®ã Perl ã§ä½ãã¡ã¢ã CRYPT htpasswd ã®ã¹ã¤ãã -n ã¯ãã¤ã¸ã§ã¹ãã STDOUT ã«åºåããã -d 㯠CRYPT ã使ã£ã¦ãã¤ã¸ã§ã¹ããä½ãã¹ã¤ããã -b ã¯ãã¹ã¯ã¼ããã³ãã³ãã©ã¤ã³ããæå®ããã¹ã¤ããã§ãããããã§ã¯ä¾ç¤ºãåç´ã«ããããã«ä½¿ã£ã¦ããã ãã§ã使ç¨ã¯æ¨å¥¨ããã¦ã¾ããã $ htpasswd -ndb user password user:ScRpgNPWh3biw åºåããããã¤ã¸ã§ã¹ãã®ãã¡æåã®äºæåãããã§ã¯ Sc ã SALT ã«ãªã£ã¦ãã¾ãã åããã¨ã Perl ã§ããã«ã¯ crypt é¢æ°ã使ãã¾ãã $ perl -E "say crypt('password', 'Sc')" ScRpgNPWh3biw -E ã¹ã¤ããã say 㯠5.10 以éã®
MD5 ã Base64 ã®è¨äºã§æ¸ããã©ã¤ãã©ãªã大ä½å®è£ ãã¦ãããMD4 ã¯æ代é ããªããããMD5 ãããå®è£ ãå°ãªãããã ãMD4 ã使ããã¦ããä¾ã¨ãã¦ã¯ãActive Directory ã§æ´»èºãã Windows çµ±åèªè¨¼ãªã©ã®åºç¤ã¨ãªã NTLM èªè¨¼ãªã©ãããã MD5 RFC http://www.ietf.org/rfc/rfc1321.txt*1 http://srgia.com/docs/rfc1321j.html MD4 RFC http://www.ietf.org/rfc/rfc1320.txt MD5 㨠MD4 ã¯é常ã«ããä¼¼ã¦ãã¦ãRFC ã®å 容ãã»ã¨ãã©åãã§ãããRFC ã§éãã®ã¯ä»¥ä¸ã®ãããªã¨ããã ã 3.4 MD5 ã§ã¯ F, G, H, I é¢æ° ããã£ãããMD4 ã§ã¯ F, G, H é¢æ°ã¾ã§ã§ G é¢æ°ã¯å 容ãç°ãªã MD5 ã§ã¯ XZ
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