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- Path: sparky!uunet!wupost!waikato.ac.nz!aukuni.ac.nz!cs18.cs.aukuni.ac.nz!pgut1
- Newsgroups: sci.crypt
- Subject: Re: IDEA cipher (was: PGP 2.0 Announcement)
- Message-ID: <1992Sep11.085627.26861@cs.aukuni.ac.nz>
- From: pgut1@cs.aukuni.ac.nz (Peter Gutmann)
- Date: Fri, 11 Sep 1992 08:56:27 GMT
- Sender: pgut1@cs.aukuni.ac.nz (PeterClaus Gutmann )
- References: <ARI.HUTTUNEN.92Sep8015936@supergirl.hut.fi> <1398@eouk9.eoe.co.uk>
- Organization: Computer Science Dept. University of Auckland
- Lines: 22
-
- In <1398@eouk9.eoe.co.uk> ahaley@eoe.co.uk (Andrew Haley) writes:
-
- >Yes, IDEA has a 128 bit key. It's rather beautiful algorithm,
- >involving multiplications mod 65537 (which is prime, so the
- >multiplications are invertible because every number (except zero) has
- >an inverse mod a prime), additions mod 65536, and XORs. These
- >operations are combined in a network which thoroughly scrambles the
- >data. There are no table lookups or bit permutations at all.
- >
- >BAD NEWS: It's PATENTED. Not just in the USA but in Europe as well.
- >If enforced, this patent will probably prevent the widespread adoption
- >of this algorithm. A great shame.
-
- However the patent owners, Ascom-Tech AG, are being very reasonable about
- the patent (totally unlike PKP). They let us use it in PGP without having
- to pay any license fees since PGP is free, and are very approachable about
- it's use in other programs. Still, I ended up not using it in my PGP-compatible
- archiver since I have a religious thing about patents - however, IDEA is a very
- good cipher and the way the patent is being administered is one of the more
- enlightened I've seen.
-
- Peter.
-