[messaging] Value of deniability

[Mike Hearn]

>
> Furthermore, the inverse is accepted routinely - digital signature
> laws in some US states. Washington State in the United States seems to
> be an example. If you have a PGP signed email, I'd expect some binding
> laws to apply for statements made in the signed portion of the text.
>

You could argue the PGP key that signed isn't yours. PGP is entirely
relative, so unless you had established it was your key is some very strong
non-WoTty way (like by getting up on stage and saying "this is my key
fingerprint" or handing out business cards with it on), then you could
still end up with some deniability.

It's for this reason that in Europe, digital signatures are only considered
valid if they're made with a PKI certificate.
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