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The following archive was created by hippie-mail 7.98617-22 on Sat Apr 10 1999 - 01:18:27
William Whyte (wwhyte@baltimore.ie)
Thu, 11 Feb 1999 09:23:20 -0000
> Does anybody have details about the Invisimail product sold by RPK
> (http://www.invisimail.com/) ? The abundance of (TM) in their FAQ, the use
> of a proprietary algorithm with some suspicious claims of unusual
> cleverness, and the lack of source code don't bode well, but one can never
> know:
Their algorithm has two stages:
1) Diffie-Hellman over GF(2^n) is used to set up a LFSR
2) The LFSRs are then used in a fairly standard way as a symmetric algorithm.
Their claim that RPK is a super-fast asymmetric algorithm only comes about
because they consider the two stages above to constitute one algorithm,
rather than an asymmetric algorithm (which is as slow as normal) followed
by a symmetric one (which is as fast as normal).
The asymmetric algorithm is as secure as Diffie-Hellman over GF(2^n). I
don't know the precise details of the symmetric part, but they should be up
on the website. There was a similar discussion on the UK Crypto list not
so long ago and someone from RPK USA stated that all the details of the
algorithm are public (not the source code though...)
Cheers,
William
The following archive was created by hippie-mail 7.98617-22 on Sat Apr 10 1999 - 01:18:27