Re: New result in predicate encryption: disjunction support

[Ben Laurie]

Scott Guthery wrote:

Those interested in predicate encryption might also enjoy Group Authentication Using The Naccache-Stern Public-Key Cryptosystem

http://arxiv.org/abs/cs/0307059

which takes a different approach and handles negation.

A group authentication protocol authenticates pre-defined groups of

individuals such that: - No individual is identified - No knowledge of which groups can be successfully authenticated is known to the verifier

I don't understand this one, could you say it again with more words?

- No sensitive data is exposed The paper presents a group authentication protocol based on splitting the

private keys of the Naccache-Stern public-key cryptosystem in such a way
that the Boolean expression defining the authenticable groups is implicit in
the split

Shamelessly, Scott

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