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  PHC 
Open Source and information security mailing list archives
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Fri, 12 Dec 2014 23:03:13 -0800
From: epixoip <>
Subject: Re: [PHC] How important is salting really?

On 12/12/2014 2:25 PM, Dennis E. Hamilton wrote:
>  --Responding to--
> From: epixoip [] 
> Sent: Friday, December 12, 2014 13:10
> To:
> Subject: Re: [PHC] How important is salting really?
> [ ... ]
> It's not just about indexing by salt, though. You still have to maintain
> a list of salts to hash each plaintext candidate with, and remove salts
> from said list when a salt is eliminated. Regardless of how you do it,
> it is the number of salts, not the number of hashes, that slows down a
> cracking job. Unless you are working with very large lists on AMD GPUs,
> but that's a whole nother can of worms.
> <orcnote>
>    I believe there is no need for the defender to maintain an index of 
>    used salts

We're talking about password cracking software, not defenders.

>    In this way, the adversary has to deal with each salt||hash combo as
>    unique, with no opportunity to exploit duplications.

We don't get an opportunity to exploit duplications, but we still get a
speedup by maintaing a separate salt table, even if all salts are
unique. You eliminate more salts faster by looping over the salts for
each word in a wordlist, as opposed to looping over the wordlist for
each hash.

Powered by blists - more mailing lists