phc-discussions - A review per day

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Message-ID: <5400EC3B.1060102@ciphershed.org>
Date: Fri, 29 Aug 2014 17:10:19 -0400
From: Bill Cox <waywardgeek@...hershed.org>
To: discussions@...sword-hashing.net
Subject: A review per day - Schvrch

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Since I do not expect a lot of Tortuga discussion, I'm moving on to
Schvrch.  Here's a link to the April discussion:

http://comments.gmane.org/gmane.comp.security.phc/1330

Here's my notes on Schvrch:

- - Weak paper and code.  I do not believe much effort went into Schvrch.
- - The time cost has weak average memory*time because only one 2KiB
block is used while applying time cost.
- - No cryptographic primitives are applied, yet the mixing function
seems weak.
- - The evolve function at end just XORs states together and complements
them, leaving each as a simple linear combination of the original.
- - The author seems to have the mistaken impresion that just XORing
data over and over will mix it well.

I don't think there's much reason to spend a lot of time discussing
this version of Schvrch.  So... I'll post one more today...

Bill
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