[cryptography] Unbreakable crypto?

John Levine johnl at iecc.com
Sat Mar 21 17:18:36 EDT 2015


>Would a commonly available large binary file make a good one-time pad?
>Something like ubuntu-14.10-desktop-amd64.iso12 maybe..

Unlkely for two reasons.  One is that the point of a one-time pad is
that only the sender and recipient are supposed to have a copy.  The
other is that something like a Linux distribution has extremely
obvious regularities, so it wouldn't be hard for a cryptographer
to figure out what it was.

The way you make a one time pad is to take a source of actual (not
pseudo) randomness and record a lot of it in a form that is relatively
easy to distribute securely, like a DVD-ROM.

R's,
John


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