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Date: Mon, 25 May 2015 22:51:48 +0200
From: Lukas Odzioba <>
Subject: PHC candidates project - irc minutes

This thread is ment to gather notes from irc meetings - currently mine
and Agnieszka's but I believe solar will be involved too. Just the
major points of the discussion are published here. I hope this will
help in co-mentoring.


A: Found problem with self test on parallel-opencl, generated
(LWS,GWS) settings are not optimal.

L: Reviewed code and pointed potential root cause of the problem in
self-test parameters. Suggested moving discussion on john-dev, and
trying to implement splitted kernel.


L: Suggested viewing atom’s “Optimizing the Computation of Hash
Algorithms as an Attacker”

A: Agreed to do it.


L: Suggested making project’s wiki page to document project advances.

A: Agreed to do wiki page.

L: Sent link to OpenCL books ( and
suggested focus on chapters about optimizations to find new ideas.


A: Looking for suggestions about possible improvements of parallel-opencl.

L: Reviewed current parallel-opencl implementation and parallel pdf spec.

A: Considered making interleaved and later vectorized implementation.

L: Suggested simplifying the current one before moving to such tasks.

A: Suggested moving parallel loop to the GPU and keep the rest on cpu side.

L: Said let’s keep it simple for now and reconsider later.

L: Suggested getting rid of general INIT UPDATE FINAL SHA512 and
making an optimized version that assumes some input bytes be always 0
- no need to initialize them and also some result of some operations
is known.

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