Message Hash: 875d25f4da9c549251fd8c7a26dab11969a03e74751bf28e662c845e3b11c8be
Message ID: <9308250839.AA20717@jobe.shell.portal.com>
Reply To: N/A
UTC Datetime: 1993-08-25 10:36:33 UTC
Raw Date: Wed, 25 Aug 93 03:36:33 PDT
From: firstname.lastname@example.org Date: Wed, 25 Aug 93 03:36:33 PDT To: email@example.com Subject: Blinding messages (newbie questions) Message-ID: <9308250839.AA20717@jobe.shell.portal.com> MIME-Version: 1.0 Content-Type: text/plain >[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?