Date: Tue, 18 Dec 2012 01:11:53 +0100 From: magnum <john.magnum@...hmail.com> To: john-users@...ts.openwall.com Subject: Re: gpg2john -> false positive -> how to exclude? On 17 Dec, 2012, at 4:01 , Dhiru Kholia <dhiru.kholia@...il.com> wrote: > On Monday 17 December 2012 04:39 AM, john@...jenski.de wrote: >> the converted gpg2john hash is: >> secring.gpg:$gpg$*17*24*1024*2fd8c6834db06ddfe073fd944b6bd8dbd268163e6374ef6f*3*255*2*3*8*bf07a2f4faafa916*65536*6c7784ea65895667 >> >> the one false positive i got is in clear-text: bortaloo >> (which is not my phrase | and thus does not work for unlocking) >> >> If you need the real secring.pgp and a ciphertext file, private email would be great :) > Hi Seb, > > This false positive is unexpected. Please send the real secring.pgp file (private email is fine). > > I can check if other softwares give "bortaloo" as the password too. I tried adding FMT_NOT_EXACT and ran it for a couple hours with a toy GPU. It found 10 "valid" guesses in 2h, 18 minutes (roughly 200 million candidates tried): bortaloo dyss ksm38b mrh1644 bh994co g5xck 24279720 w0wory lt5ntyb 25318696 This "hash" type use the simplest checksumming that will give one false positive out of 64K tries. I notice the 'datalen' is short compared to the test vectors - apparently short enough to emit a false positive from the BN_bin2bn() function once out of about 300 tries. When both these false positives occur for one same candidate, it will result in a false guess (about once in 20 million tries). magnum
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