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Date: Fri, 5 Apr 2013 18:53:18 +0000
From: Marsh Ray <>
To: "" <>
Subject: RE: [PHC] Testing Password Hashing functions

> -----Original Message-----
> From: Matthew Green []
> Sent: Friday, April 5, 2013 10:50 AM
> To:
> Subject: Re: [PHC] Testing Password Hashing functions
> Formally, the right tool here is to ask for a proof that the construction is
> indifferentiable from a random oracle -- assuming that the building blocks
> (underlying hash functions, block ciphers, etc.) also meet similar criteria.
> The submitters don't have to write this proof, but it would be one of the
> criteria for analysis. Since most of these functions will probably be based on
> 'standard' building blocks, this shouldn't be an enormous stretch.

The changes between PBKDF1 and PBKDF2 are interesting WRT differentiability-from-RO, particularly length extension and image shrinkage.

- Marsh

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