phc-discussions - Re: [PHC] further limitation: not writing secret to memory

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

Date: Wed, 18 Sep 2013 20:48:41 +0200
From: Krisztián Pintér <pinterkr@...il.com>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] further limitation: not writing secret to memory

Steve Thomas (at Wednesday, September 18, 2013, 7:58:25 PM):

>     This would not work as you can simply xor two values together
> to remove r. (m0 + r) + (m1 + r) = m0 + m1  

busted

> I really don't see the point in all of this. Since if the
> attacker is on the authentication box

offline. consider a stolen laptop. not necessarily able to tamper the running system. this IS a different attack model, and makes sense.

> I'm pretty sure page locked memory [...] never gets written to swap.

on a windows box, there are multiple ways of telling the OS not to swap a memory block. but neither of those guarantees anything. i'm not a linux guy, but as i'm informed, you can't do that ony linux either.