-----BEGIN PGP SIGNED MESSAGE----- On Tue, 23 Jul 1996, Jerome Tan wrote:
How can I decrypt Unix password file?
You can't decrypt a password file. The password is hashed by using the password as a DES key, and encrypting a string of 8 NULs 25 times. The E-tables of the DES algorithm are permutated according to the twelve-bit salt which is encoded in the first two characters of the hashed password field. The E-tables are permutated by swapping the entries N and N+24 if the Nth bit of the salt value is 1. A salt value of 0 will result in straight DES being used 25 times. This is the only salt value that can't be used in the UNIX password file. A program like Crack will use a dictionary attack to crack a password file. It's available at ftp://ftp.funet.fi/pub/security. - -- Mark PGP encrypted mail prefered Key fingerprint = d61734f2800486ae6f79bfeb70f95348 http://www.voicenet.com/~markm/ -----BEGIN PGP SIGNATURE----- Version: 2.6.3 Charset: noconv iQCVAwUBMfT77bZc+sv5siulAQGPpwP/R93/3Z4o14CYeYNZOBa0kK7tArcDAP12 bWG1pw0pW0FZDbWg12LOz8xZbvAiSe88sNQhuzs8b8GwS71yzhGDwCMRFGjIealE xiUch7b6qnE9w9H7gV80nxcVTS/sRzEqYxjhT8JRU9YalS5CvzVo1ciTSj28xDs7 e62HYbBpTKI= =E0Wh -----END PGP SIGNATURE-----