Date: Fri, 3 Jan 2014 11:27:12 +0400 From: gremlin@...mlin.ru To: oss-security@...ts.openwall.com Cc: gremlin@...mlin.ru Subject: Re: kwallet crypto misuse On 02-Jan-2014 09:15:15 +0100, Florian Weimer wrote: > I just noticed this is now public: > http://gaganpreet.in/blog/2013/07/24/kwallet-security-analysis/ > Short summary: kwallet uses Blowfish to encrypt its password > store, and despite an attempt at implementing CBC mode (in a > file called cbc.cc no less), it's actually ECB mode. That's unpleasant, but not really a fatal issue... > UTF-16 encoding combined with Blowfish's 64 bit block size means > there are just four password characters per block. But this is: any and all passwords, being used for encryption key generation, must be hashed, then salted, then hashed again. SHA-256 may be a good choice for generating Blowfish 256-bit key this way. > Encryption is convergent as well. This may enable recovery of > passwords through codebook attacks. Should we treat this as a > minor vulnerability? Is it really minor? -- Alexey V. Vissarionov aka Gremlin from Kremlin <gremlin ПРИ gremlin ТЧК ru> GPG: 8832FE9FA791F7968AC96E4E909DAC45EF3B1FA8 @ hkp://keys.gnupg.net
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