Password length paranoia

Oskar L. oskar at rbgi.net
Tue Feb 7 16:34:12 CET 2006


"Gabriele Alberti" <iz0ayv at yahoo.com> wrote:

> Keeping in mind my password can be composed with all 95 writeable ascii
> chars,
> using for example a 15 chars password gives me a "password space" of
> 95^15,
> that is  463291230159753366058349609375 passwords..*much* smaller than the
> 256
> bit keyspace (2^256,

This is of course only true if the attacker knows it is exactly 15
characters long. If not, then it should be calculated like this: 95^1 +
95^2 + 95^3 + ... + 95^15.

Oskar



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