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- Newsgroups: sci.crypt
- Path: sparky!uunet!caen!hellgate.utah.edu!hellgate!moore
- From: moore@cs.utah.edu (Tim Moore)
- Subject: Unerasable digitital signatures?
- Message-ID: <MOORE.92Oct13142022@defmacro.cs.utah.edu>
- Organization: University of Utah CS Dept
- Date: 13 Oct 92 14:20:21
- Lines: 23
-
- There seems to be a lot of info available on digital signatures using
- public key cryptography. Typically, these encode a hash of a message,
- and maybe a timestamp, using the author's private key. The combination
- of the document and signature guarentee authenticity.
-
- However, this scheme has some problems. If an author wishes to remain
- anonymous but wants to certify the integrity of a document as it
- leaves his machine, he can't sign using his private key. Also, if an
- author is not widely known, someone could delete the author's
- signature from the plaintext, possibly make changes, and then sign the
- document as his own. While a digital timestamp would resolve any
- confrontation between the original author and the plagiarist, the
- altered document could be widely distributed before the forgery was
- discovered.
-
- So, are there any techniques for creating unerasable digital
- signatures that are inseparable from their documents? Methods for
- implementing electronic money might be applicable.
-
- --
- Tim Moore moore@cs.utah.edu {bellcore,hplabs}!utah-cs!moore
- "Wind in my hair - Shifting and drifting - Mechanical music - Adrenaline surge"
- - Rush
-