WGU Course C839 - Intro to Cryptography Questions and rational answers.

WGU Course C839 - Intro to Cryptography Questions and rational answers. uses at least two different shifts, changing the shift with different letters in the plain text. A Atbash B multi-alphabet encryption C Scytale D Caesar cipher - Answer B was designed to provide built in cryptography for the clipper chip. A Blowfish B Skipjack C GOST D 3DES - Answer B Which of the following uses an 80 bit key on 64 bit blocks? A Twofish B AES C Skipjack D DES - Answer C With , the message is divided into blocks and each block is encrypted separately. This is the most basic mode for symmetric encryption. A Electronic codebook (ECB) B Cipher-block chaining (CBC) C Cipher feedback (CFB) D Output feedback (OFB) - Answer A Which of the following is an example of an unbalanced Feistel? A 3DES B Skipjack C Twofish D AES - Answer B This process is done by having each block of plaintext is XORed with the previous ciphertext block before being encrypted. A Output feedback (OFB) B Cipher-block chaining (CBC) C Electronic codebook (ECB) D Cipher feedback (CFB) - Answer B The process wherein the ciphertext block is encrypted then the ciphertext produced is XOR'd back with the plaintext to produce the current ciphertext block is called what? A Output feedback (OFB) B Cipher-block chaining (CBC) C Cipher feedback (CFB) D Electronic codebook (ECB) - Answer C