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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