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Date: Sun, 22 Apr 2018 14:13:40 +0200
From: Solar Designer <>
Subject: [openwall-announce] yescrypt 1.0.1


As announced previously, yescrypt is a password-based key derivation
function (KDF) and password hashing scheme.  It builds upon scrypt, and
our implementation is able to compute native yescrypt hashes as well as
classic scrypt.

This is to announce the update of yescrypt to 1.0.1, available for
download from the project's homepage:

The following changes have been made between 1.0.0 and 1.0.1:

The included documentation has been improved, most notably adding new
text files PARAMETERS (guidelines on parameter selection, and currently
recommended parameter sets by use case) and COMPARISON (comparison to
scrypt and Argon2).

Code cleanups have been made, including removal of AVX2 support, which
was deliberately temporarily preserved for the 1.0.0 release, but which
almost always hurt performance with currently recommended low-level
yescrypt parameters on Intel & AMD CPUs tested so far.  (The low-level
parameters are chosen with consideration for relative performance of
defensive vs. offensive implementations on different hardware, and not
only for seemingly best performance on CPUs.  It is possible to change
them such that AVX2 would be worthwhile, and this might happen in the
future, but currently this wouldn't be obviously beneficial overall.)


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