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Message-ID: <927750830c3c68b5b018eedc40b30213@smtp.hushmail.com>
Date: Wed, 13 May 2015 17:43:50 +0200
From: magnum <john.magnum@...hmail.com>
To: john-users@...ts.openwall.com
Subject: Re: raw-md5 vs raw-md5u, one hash with 2 different passwords
On 2015-05-12 10:38, Aleksey Cherepanov wrote:
> In 2012 Alexander Cherepanov noticed that raw-md5u format can be
> cracked as raw-md5 in some cases: 2 spaces represent the dagger symbol
> "(U+2020) which exist in windows code pages and, [he] think, can
> easily be entered from keyboard. If a unicode password consists of
> only such symbols then it can be found by trying various printable
> ascii characters in non-unicode way. But such cross-matches seem small
> and exotic."
> (...)
> Conclusion: One ciphertext may be crackable as different formats and
> may represent different passwords. So when we are not sure in the
> format and we got a crack, it does not reliably mean that we guessed
> the format right. Though it is a rare case.
The dagger is a curious example. A similar but less exotic thing happens
with hashes of non-Unicode strings, ie. strings including non-ASCII
characters in some 8-bit single byte codepage.
CP437: Müller
CP154: MҒller
CP737: MΒller
CP856: Mבller
CP864: M·ller
CP932: M〕ler
CP936: M乴ler
CP949: M걄ler
CP950: Mler
CP1046: M×ller
CP1125: MБller
CP1251: MЃller
CP1256: Mپller
All the above encodes to the same six-byte string with \x81 as second
byte, and all would obviously get the same LM (or any other) hash. There
are many more codepages than these, I just picked some my iconv(1) could
handle for this byte.
BTW note that CP932..CP950 seem to swallow the first "l" so they are
probably multibyte endocings just like UTF-8. They produce some
character from "\x81\x6c". Regardless, they too are very same binary string.
magnum
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