G 3DES is rarely used now because the algorithm Question 19 1 pts If a key exchange method has forward secrecy, what does that mean? That a compromise of a master key doesn't compromise previous session keys Different keys will be used for each session even if the same parameters are used Keys are encrypted with a public key cryptography system before being forwarded to the other party The method of key exchange can be changed on the fly Question 20 1 pts The Diffie-Hellman method for key exchange relies on which difficult to solve mathematical problem? The difficulty in factoring the product of large primes The elliptic curve trap Discrete logarithms Riemann hypothesis