[cryptography] Unbreakable crypto?
kevinsisco61784 at gmail.com
Fri Mar 20 13:01:32 EDT 2015
On 3/20/2015 12:06 PM, Tony Arcieri wrote:
> On Fri, Mar 20, 2015 at 4:02 AM, Enrique Soriano <esoriano at lsub.org
> <mailto:esoriano at lsub.org>> wrote:
> These days we can buy 128GB pendrives (i.e. very long pads) for $35.
> This simple approach seems viable to me:
> Poorly implemented, one time pads are in fact quite dangerous:
> 1) Extremely great care must be taken to never reuse any portion of
> the pad. When reused, the attacker can easily obtain the XOR of the
> plaintexts encrypted with the reused portion of the pad
> 2) Without authentication (i.e. a MAC), one time pads are highly malleable
> The author of that software doesn't know the difference between a one
> time pad and a stream cipher. There's no practical reason to prefer a
> one time pad to a modern stream cipher like ChaCha20, which can be
> combined with the Poly1305 MAC to create an authenticated encryption
> scheme that isn't malleable like an unauthenticated one time pad.
> Tony Arcieri
> cryptography mailing list
> cryptography at randombit.net
I am trying to contact the "company" and it is not easy. They don't
want people looking into them or the product they offer. I guess it's
fraud; I am disillusioned. If you hold real still and listen, you can
here the sound of my bubble bursting.
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