[cryptography] key exchange patented :)
James A. Donald
jamesd at echeque.com
Thu Nov 22 16:06:10 EST 2012
On 2012-11-22 10:24 PM, ianG wrote:
> giving thanks to wisdom of intellectual property:
> the infringement lies solely in the use of the SSL or TLS �handshake�...
> cryptography mailing list
> cryptography at randombit.net
Actually this does not patent key exchange: It is a snake oil
encryption system that has a superficial resemblance to systems actually
You have two unspecified pseudo random generators at each end, which
start from the same seed, the pre-shared secret. Then, instead of
directly xoring the key stream with the message, you use the output from
each pseudo random generator to key RC4.
To be actually useful, the random number generator would need to be
cryptographically strong, and if cryptographically strong, the RC4 step
So the patented procedure is not only one that no one uses, it is one
that no one would use.
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