phc-discussions - Re: [PHC] Re: Suggestion: API should include a verifier function

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date: Thu, 28 Mar 2013 03:24:17 +0000
From: Peter Gutmann <pgut001@...auckland.ac.nz>
To: "discussions@...sword-hashing.net" <discussions@...sword-hashing.net>
Subject: Re: [PHC] Re: Suggestion: API should include a verifier function

Watson Ladd <watsonbladd@...il.com> writes:

>This isn't necessary: a non-constant time comparison at worst reveals the
>hash, which doesn't give an attacker enough information to break a password
>anyway if we do our jobs right.

Oh yes it can ;-).  There's a clever attack that was presented at Kiwicon last
year that turns timing attacks on hashed passwords into partial attacks on the
original passwords.  It'll appear in the Crypto Corner column of IEEE Security
and Privacy in (AFAIK) the next issue.

Peter.