IDEA (was: Re: Decryption problem)

Robert Fendt
Wed, 15 Sep 1999 16:23:42 +0200 (MEST)

This message is in MIME format
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: quoted-printable

On 15-Sep-99 Werner Koch wrote:

>> No, for real (non-commercial) use. And I don't care that is is patented.
>> I use IDEA (and RSA, but I'm outside the US) with 2.x anyway.
> Don't let Ascom know this. They even require license fees when IDEA
> is used by charities.
That's because Ascom defines this as "commercial purposes" (commercial purp= oses include the use by non-profit organisations; see ). The use by a "private individual" for "non-commercial purposes" is, by my understanding, free. Nevertheless, this stands in direct contrast to the GP= L; so, IDEA cannot be incorporated into GnuPG. This brings me to an interesting question: one of the two algorithms' paten= ts (RSA and IDEA) ends somewhere in 2001, I think. But I can't remember, which one; IDEA would be interesting, because it still is one of the best symmetr= ic ciphers available (it's fast *and* secure). And how long lasts the other? ElGamal, for example, is only free because it's patent ended 1997 or so... And: how specific are these patents anyway? Would it be possible to create = a different cipher based on the same mathematical principle (and therefore wi= th comparable qualities) without breaking a patent? After all, RSA is faster than DH, and IDEA has undergone extensive analysis. Regards, Robert --=20 Robert Fendt <> public PGP key available ! (momentarily only via (e)mail) --_=XFMail.1.3.2pre1.p0.Linux:990915150720:10198=_ Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.0 (GNU/Linux) Comment: For info see iEYEABECAAYFAjffmggACgkQNpvtgReJ9d9EBQCfWvzNTh0Ph6cWjdszDXgME/2q h0IAoJdQ2e43YaX8+iUg6s4vVYI8PiVY =UfLf -----END PGP SIGNATURE----- --_=XFMail.1.3.2pre1.p0.Linux:990915150720:10198=_-- End of MIME message