[cryptography] The Unbreakable Cipher

Mansour Moufid mansourmoufid at gmail.com
Sat Sep 28 18:16:52 EDT 2013


On Wed, 2013-09-25 at 10:11 -0400, John Young wrote:

> [Answer to the question:] "Does there exist an unbreakable cipher" 
> would be this, "Every cipher is breakable, given enough traffic, and 
> every cipher is unbreakable, if the traffic volume is restricted
> enough."
> 
> [End quote]
> 
> Is this conclusion still valid? If so, what could be done to restrict
> traffic volume to assure unbreakablility? And how to sufficiently test
> that. Presuming that NSA and cohorts have investigated this effect.

Sure it is. XTS-AES must be rekeyed after each terabyte; WEP was limited
by a 24-bit initialization vector; etc. There are always limits, but
sometimes they are literally astronomical.




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