[Standards-JIG] Re: The Great Encryption Debate

Ian Paterson ian.paterson at clientside.co.uk
Tue Aug 16 18:51:04 UTC 2005


> > Three very different e2e cases have been identified:
> > 
> >    A. One-to-one (including session, offline and object encryption)
> >    B. One-to-many
> >    C. Many-to-many
> 
> You can scratch many-to-many unless you want a bunch
> of people sharing a resource.

You're right if we're talking about one-off messages (as in the
one-to-many case). But if we're talking sessions then many-to-many would
be valid (e.g. a conference room).

There are some fascinating cryptographic possibilites. For example,
Deniable Ring Authentication
http://www.wisdom.weizmann.ac.il/~naor/PAPERS/denring.pdf

- Ian




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