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Paper 2015/151

Bad directions in cryptographic hash functions

Daniel J. Bernstein and Andreas Hülsing and Tanja Lange and Ruben Niederhagen

Abstract

A 25-gigabyte "point obfuscation" challenge "using security parameter 60" was announced at the Crypto 2015 rump session; "point obfuscation" is another name for password hashing. This paper shows that the particular matrix-multiplication hash function used in the challenge is much less secure than previous password-hashing functions are believed to be. This paper's attack algorithm broke the challenge in just 19 minutes using a cluster of 21 PCs.

Metadata
Available format(s)
PDF
Category
Secret-key cryptography
Publication info
Preprint. MINOR revision.
Keywords
symmetric cryptographyhash functionspassword hashingpoint obfuscationmatrix multiplicationmeet-in-the-middle attacksmeet-in-many-middles attacks
Contact author(s)
authorcontact-obviouscation @ box cr yp to
History
2015-02-27: received
Short URL
https://ia.cr/2015/151
License
Creative Commons Attribution
CC BY
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