Cryptography

What is the strategy employed by system architects to frustrate attackers and enhance computer security?

• Encryption

• Defence in depth

• Substitution ciphers

• Columnar transposition ciphers

What is the biggest drawback of basic substitution ciphers?

• They preserve letter frequencies

• They are difficult to decode

• They require a complex algorithm

• They are easy to break

What is the process called when text is made secret using a cipher?

• Decryption

• Encryption

• Substitution

• Permutation

What is the name of the encryption technique that uses a series of substitutions and permutations based on the key value?

• Caesar cipher

• Data Encryption Standard

• Advanced Encryption Standard

• Diffie-Hellman Key Exchange

What does the little padlock icon on a secure website indicate?

• The server's public key

• Symmetric encryption

• Key exchange

• Public key cryptography