True or False? When replacing crypto keys, they must be all replaced 1 month at a time. True O False Which of the following security protections is used to prevent passive attacks? b) Integrity O d) Nonrepudiation O c) Authenticity O a) Confidentiality Associate the following concepts with the appropriate secret-key building blocks. Use a KEK to encrypt a TEK [Choose] Shared secret hashing Key distribution center Key wrapping I RUSC Build a unique TEK from nonces and a secret Shares a separate KEK with each registered user [Choose ] Why do protocols like IKE and SSL exchange nonces as part of their key creation/exchange protocol? Select all that apply. a) The nonces provide additional secret randomness to make the generated keys harder to guess. b) If the nonces are always different, then the protocol yields a different result each time it takes place. c) New nonce values should make it impossible for an attacker to replay a previous set of messages and force the connection to reuse a previous key. d) The nonces increase the protocol's execution time to reduce the effectiveness of trial-and-error attacks on the protocol