phc-discussions - Re: [PHC] Transforming hash to different cost setting

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Date: Sat, 22 Mar 2014 00:14:40 -0700
From: Jeremi Gosney <epixoip@...dshell.nl>
To: discussions@...sword-hashing.net
Subject: Re: [PHC] Transforming hash to different cost setting

On 3/22/2014 12:09 AM, Sweta Mishra wrote:
> What does the  'Ability to transform an existing hash to a different
> cost setting without knowledge of the password', mean exactly?

Simply put, it means the ability to take a password hash from the
database and upgrade it to a higher cost setting without knowing the
password. This way administrators can upgrade the security of an entire
database without hooking the login process to re-hash the password, or
forcing users to change their passwords.