plausibly deniable

David Shaw dshaw at
Thu Jul 22 23:17:40 CEST 2010

On Jul 22, 2010, at 4:26 PM, Robert J. Hansen wrote:

> On 7/22/2010 4:19 PM, Andre Amorim wrote:
>> Do we have a "plausibly deniable" option ?
> No.  Plausible deniability depends entirely on what your adversary finds
> plausible.  "I didn't sign that!  Look -- I have Thunderbird configured
> to automatically sign *everything*, and I have no passphrase on my key.
> Someone got access to my system and sent out a message that got
> automagically signed by my key!"
> Such things have happened before.  Werner himself has received
> PGP-signed spam, from some hapless person whose machine had been
> hijacked and was being used as a botnet to send messages through a PGP
> signing proxy.  Some people will find this explanation plausible.
> Others will merely find it convenient.
> Since there is no agreed-upon definition of plausible deniability, GnuPG
> cannot be said to provide plausible deniability.

By that logic, no program can be said to provide plausible deniability ;)

(Not that I necessarily disagree - I tend to get stuck on the "plausible" part of the deniability.  If things reach the point where you're relying on plausible deniability to save you, you're already in deep trouble.)


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