[cryptography] Unbreakable crypto?

Aaron Turner synfinatic at gmail.com
Sun Mar 22 00:25:52 EDT 2015


On Sat, Mar 21, 2015 at 8:37 PM, Lee <ler762 at gmail.com> wrote:
> 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.

So you're looking for a crypto system which is secure against an
attacker having a copy of the key?


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