Aldius <aldius@mindless.com> writes:
The reason for having two key types for PGP5 is that DH is only capable of key distribution, not signing.
DH is an interactive key negotiation protocol. El Gamal is the key exchange algorithm used in PGP5. For some reason PGP Inc insists on calling El Gamal "DH". El Gamal is a variant of DH; so it is related. But El Gamal is not DH, and it is bad terminology to call it DH. The only reason I can think that they insist on calling El Gamal "DH" at every opportunity is that they perhaps think that the name DH (Diffie-Hellman) is more widely known, and want to give people warm fuzzies "oh I've heard of that algorithm".
and DSS is only capable of signing. Hence, you require one key to sign, and one to distribute the session key.
right. Adam -- Now officially an EAR violation... Have *you* exported RSA today? --> http://www.dcs.ex.ac.uk/~aba/rsa/ print pack"C*",split/\D+/,`echo "16iII*o\U@{$/=$z;[(pop,pop,unpack"H*",<> )]}\EsMsKsN0[lN*1lK[d2%Sa2/d0<X+d*lMLa^*lN%0]dsXx++lMlN/dsM0<J]dsJxp"|dc`