[Cryptography] Langsec & authentication

[Stephan Neuhaus]

On 2014-05-27, 21:30, Judson Lester wrote:
> But, and this is the other half of my dilemma, authenticating
> ambiguous blobs of data opens a giant hole in your MAC system: here's
> two documents that mean "re-order coffee" and "nuke North Korea" with
> the same MAC. Oops. And while that's theoretically possible
> regardless, it becomes much easier to do if there's many many ways to
> say "nuke North Korea."

Once you have ambiguous blobs of data, one of which means "re-order
coffee" and the other meaning "nuke North Korea", you've lost the game.
 But surely that's not the fault of the authentication subsystem.

Fun,

Stephan
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