Blinding messages (newbie questions)
nobody at shell.portal.com
nobody at shell.portal.com
Wed Aug 25 03:36:33 PDT 1993
>[Karl Barrus describes blinding]
Excellent post! Can you tolerate a few newbie questions?
> Conceptually, when you blind a message, nobody else can read it.
So "blinding" is a synonym for encryption with your own public
key, aka multiplication by a very-hard-to-factor number?
> under the right circumstances if another
> party digitally signs a blinded message, the unblinded message will
> contain a valid digital signature.
In other words if Alice encrypts and Bob signs, Da(Db(Ea(M))) = Db(M)?
Under what conditions? Does RSA (in PGP) satisfy those conditions?
> If someone asks
> you to digitally sign a random stream of symbols, remember that what you
> sign may be unblinded to reveal a contract, etc.
For what applications would Bob want to sign an encrypted contract
instead of a plaintext?
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