Re: Diffie Hellman + AES (Rjindael) Patent/Licensing?

From: harlequin (harlequin@nospampleasewerebritish.nekrodomos.net)
Date: 02/20/03 

From: "harlequin" <harlequin@nospampleasewerebritish.nekrodomos.net>
Date: Thu, 20 Feb 2003 17:39:18 +0000

On Thu, 20 Feb 2003 15:50:23 +0000, Davidoff0707 wrote:

> Hello,

Hi

> I would like to know if Diffie Hellman and AES (Rjindael) are protected by
> a patent, and if any licensing is required. I am developing a small
> production line (100 units) of an encrypted cell phone TTY (for the deaf)
> unit.

Rijndael, as an AES candidate, was required to state a guarantee that it
would be royalty-free.

The Diffie-Hellman patent expired (I believe) in September 2000. If I
understand correctly, then this must also be freely available.

> Diffie Hellman will be used to exchange the keys for the symmetric
> algorithm (AES - Rjindael). Overall I need to know if DH and AES are
> patended, and if any licensing fees are requried. If they are patented,
> which firms hold the patents, and how much is their licensing fee?

As above. Rijndael -> definitely no fee required. Diffie-hellman -> I'm
less sure, but I'm almost certain that no fee is required.

H 

-- 
"He who controls the past controls the future; he who controls the present
controls the past."
   -- O'Brien in Orwell's "1984"

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