At 21:02 00/07/19 +0100, Simon Aronson wrote:
>In an implementation of the ElGamal cryptosystem, is it acceptable to always
>use the same prime and generator for every transmission? Or should a new
>prime/generator pair be chosen for each communication?
Yes, in fact you pretty much have to, since they are used to create the
public key from the private key. Except for creating a very big target,
there's no real reason why eveyone shouldn't share the same prime and
generator; IPSec standardises a couple (of different sizes).
Greg.
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