[cryptography] Unbreakable crypto?

Lee ler762 at gmail.com
Sat Mar 21 23:37:05 EDT 2015

On 3/21/15, James A. Donald <jamesd at echeque.com> wrote:
> On 2015-03-22 10:34, James A. Donald wrote:
>> On 2015-03-22 06:13, Lee wrote:
>>> Would a commonly available large binary file make a good one-time pad?
>>> Something like ubuntu-14.10-desktop-amd64.iso12 maybe..
> I wrote:
>> Before you asked the question, probably would have made a good one time
>> pad.
>> Not any more.
> Of course, it was never really a one time pad, merely security by
> obscurity - which is quite good, until it is quite bad.

How is a one time pad not security by obscurity?   As soon as the
opponent gets a copy it's game over.


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