Security Ch.4

Which of the following is NOT a method for strengthening a key?

• Randomness

• Cryptoperiod

• Length

• Variability

Which of the following block ciphers XORs each block of plaintext with the previous block of ciphertext before being encrypted?

• Electronic Code Book (ECB)

• Galois/Counter (GCM)

• Counter (CTR)

• Cipher Block Chaining (CBC)

What entity calls in crypto modules to perform cryptographic tasks?

• Certificate Authority (CA)

• OCSP Chain

• Intermediate CA

• Crypto service provider

_____ are symmetric keys to encrypt and decrypt information exchanged during the session and to verify its integrity.

• Encrypted signatures

• Session keys

• Digital certificates

• Digital digests

Which of these is considered the strongest cryptographic transport protocol?

• TLS v1.2

• TLS v1.0

• SSL v2.0

• SSL v2.2

The strongest technology that would assure Alice that Bob is the sender of a message is a(n) _____.

• digital signature

• encrypted signature

• digest

• digital certificate

A digital certificate associates _____.

• a user's public key with his private key

• the user's identity with his public key

• a user's private key with the public key

• a private key with a digital signature

Digital certificates can be used for each of these EXCEPT _____.

• to verify the authenticity of the Registration Authorizer

• to encrypt channels to provide secure communication between clients and servers

• to verify the identity of clients and servers on the Web

• to encrypt messages for secure email communications

An entity that issues digital certificates is a _____.

• Certificate Signatory (CS)

• Digital Signer (DS)

• Certificate Authority (CA)

• Signature Authority (SA)

A centralized directory of digital certificates is called a(n) _____

• Digital Signature Permitted Authorization (DSPA)

• Digital Signature Approval List (DSAP)

• Certificate Repository (CR)

• Authorized Digital Signature (ADS)