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Re: kwallet crypto misuse
From: gremlin () gremlin ru
Date: Fri, 3 Jan 2014 11:27:12 +0400

On 02-Jan-2014 09:15:15 +0100, Florian Weimer wrote:

I just noticed this is now public:
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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