Date: Mon, 27 Jun 2011 02:06:27 +0300 From: Martin T <m4rtntns@...il.com> To: john-users@...ts.openwall.com Subject: brute force attack of an Unix crypt Checking the CPU usage of my 4-core Xeon X3220(4x 2.4GHz) processor, I found out, that I had started an brute force attack at the beginning of February(!). I had dedicated an entire CPU core for this process: UID PID PPID C STIME TTY TIME CMD root 7262 6307 99 Feb05 pts/9 271-18:45:57 john --incremental=All8 --session=8 unix_crypt.txt .."unix_crypt.txt" looks like this: root@...tin-desktop:~# cat unix_crypt.txt martin:HkbEPpfxBdH3k root@...tin-desktop:~# ..and incremental mode part is specified in /etc/john/john.conf: [Incremental:All8] File = /usr/share/john/all.chr MinLen = 8 MaxLen = 8 CharCount = 95 I remember that I really used letters, numbers and special characters(8 characters in total) in order to generate this crypt file. I even found the terminal where I started this command and if I pressed enter few times, following was printed to the terminal: guesses: 0 time: 139:15:12:09 c/s: 930654 trying: l5rBse_N - l5rBsil$ guesses: 0 time: 141:15:32:12 c/s: 929241 trying: 1doccLl4 - 1doccLur guesses: 0 time: 141:15:32:15 c/s: 929241 trying: 1dau4qf! - 1dau4qwp guesses: 0 time: 141:15:34:21 c/s: 929241 trying: 1jeTL x8 - 1jeTL e# guesses: 0 time: 141:18:48:12 c/s: 929072 trying: 2kageA3z - 2kageACs How much longer it might take to decrypt this Unix crypt? regards, martin
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