Multikey crypto

DrZaphod drzaphod at brewmeister.xstablu.com
Wed Jan 26 21:22:12 PST 1994


> Has anyone ever done anything with an encryption scheme that allows 
> multiple unlocking keys? What I'm thinking about is a way to encrypt 
> some data and then create multiple keys that will decrypt the data. I 
> want to be able to encrypt a document and then give multiple people 
> access to the document and be able to lock out a key and/or generate 
> new keys without having to redistribute keys to everybody that already 
> has one.
--> Mike Markley             

	I was thinking about this the other day.. and my first reaction
was the following.

	What if you encrypted the document with p/k and made multiple
copies of the same [private] key.  Then you encrypted each copy of the
key with a user's public key.  Now each user has a copy of the private key.
If you decide Joe SHOULDN'T have access to the data anymore, you can
re-encrypt the document and redistribute the p/k encrypted copies of the
key.  There may be some fancy algorithms to achieve more security.. and
ease of use.. but that's the answer I came up with.  TTFN!
  

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