On Sun, 6 Oct 2002, Mikko Työläjärvi wrote:
>
> tr -cd a-zA-Z0-9 < /dev/urandom | dd bs=$len count=1 2>/dev/null
>
> Which will give you $len random bytes from the set a-zA-Z0-9 (it reads
> a lot more from /dev/urandom than it produces though).
yes, and that is bad :(
It is not good to mess with /dev/[u]random more than what's really needed,
because you can exhaust the entropy pool, and that's a Bad Thing.
In your home box, for learning purposes, that's OK, but in a production box
which needs a good working prng (for crypto session keys, auth cookies and the
like) it is not acceptable to "eat" all the entropy pool unless you have
a very good reason to do so.
Fer
>
> Another answer is, as always, "use perl" :-)
>
> $.02,
> /Mikko
>
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