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Date: Thu, 23 Aug 2012 18:14:17 +0200
From: Lukas Odzioba <lukas.odzioba@...il.com>
To: john-dev@...ts.openwall.com
Subject: Re: How should one select PLAINTEXT_LENGTH in a format
2012/8/23 Claudio André <claudioandre.br@...il.com>:
> Hi
>
> How do i choose a number to use as the maximum length of a plaintext
> password. 16, 24, 32, ...?
>
> Do you guys have a rule? Or, at least, advices?
>
> Claudio
>
> PS: thanks Lukas
Technically it should be as big as you can make. However some formats
have specific optimizations for shorter passwords. I use something
like that (not always - mea culpa)
- If you can handle looooooooong passwords, without speed drop for
shorter ones do it
- Today we should support at least 15chars, considering last crack me
if you can contest it is good to have 20+
- On gpu's 15,31 usually works good because reads are nicely aligned
if you add one more byte to store lenght.
- It is good to have tests up to supported length.
- When you choose something it is good to make sure that your code can
really handle it - you can try add some tests to TS.
Lukas
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