Review Questions

@ciphor text

@Ciphor bext Decryption

$2\mathrm{.}1$ What are the essential ingredients of a symmetric cipher?

$2\mathrm{.}2$ What are the two basic functions used in encryption algorithms?

$2\mathrm{.}3$ How many keys are required for tyo people to communicate via a cipher? O ne Key

What is the difference between ablock cipher and a siream cipher?

$2\mathrm{.}5$ What are the two general approaches to attacking a cipher?

$2\mathrm{.}6$ List and briefly define types of cryptanalytic attacks based on what is known to the attacker.

What is the difference between an unconditionally secure cipher and a computationally secure cipher?

$2\mathrm{.}8$ Briefly define the Caesar cipher.

$2\mathrm{.}9$ Briefly define the monoalphabetic cipher.

$2\mathrm{.}16$ Briefly d$$fine the Playfair cipher.

$11$ What is the difference between a monoalphabetic cipher and a polyalphabetic cipher?

$2\mathrm{.}12$ What are two problems with the one$-$time pad?

$2\mathrm{.}13$ What is a transposition cipher?

$2\mathrm{.}14$ What is steganography?