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Date: Fri, 5 Apr 2013 16:54:22 +0000
From: Marsh Ray <>
To: "" <>
Subject: RE: [PHC] Testing Password Hashing functions

> -----Original Message-----
> From: Yann Droneaud []
> Sent: Friday, April 5, 2013 8:53 AM
> To:
> Subject: Re: [PHC] Testing Password Hashing functions
> So using the PRNG test is probably a first evaluation step, but doesn't seems
> to be enough.

Agree. They're a useful sanity check.

RC4 is an example of a PRNG that wouldn't pass basic statistical tests.
AES-128 in CTR mode with the key and plaintext inputs switched is a simple example of a PRNG which would pass all statistical tests and yet be completely broken.

An additional requirement of a password hashing function over a PRNG is that it require a significant amount of work to compute which no one can optimize away. I'm not sure statistical tests can help much here.

> So what others tools, methods are going to be used to evaluate password
> hash functions ?

My impression is that the construction of any potentially-reusable parts of the tools is so much easier than the analysis itself that it's almost a rite of passage for researchers to write their own. Unfortunately, only a few end up as open source.

There's a few at

Marc Stevens makes his MD5 and SHA-1 tools open source

- Marsh

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