What are the general equations for encryption and decryption in the affine cipher?

What are the general equations for encryption and decryption in the affine cipher?

Answer:

E(x)= ax+b mod 26
D(y)= E^1 (y-b) mod 26

Describe a relationship between plaintext, encryption, decryption and cipher

Describe a relationship between plaintext, encryption, decryption and cipher

Answer:

text
Ciphertext=Encryption(Plaintext)
Plaintext=Decryption(Ciphertext)

Carlos wants to send a message to Alice so only she can understand it. He also wants to send a message to Bob so only Bob can understand it. How many private keys does Carlos need?

Carlos wants to send a message to Alice so only she can understand it. He also wants to send a message to Bob so only Bob can understand it. How many private keys does Carlos need?

A) 1
B) 2
C) 3
D) 0

Answer: D

The _________ attack can endanger the security of the Diffie-Hellman method if two parties are not authenticated to each other.

The _________ attack can endanger the security of the Diffie-Hellman method if two parties are not authenticated to each other.

A) man-in-the-middle
B) ciphertext attack
C) plaintext attack
D) none of the above

Answer: A

The ________ method provides a one-time session key for two parties.

The ________ method provides a one-time session key for two parties.

A) Diffie-Hellman
B) RSA
C) DES
D) AES

Answer: A

One commonly used public-key cryptography method is the ______ algorithm.

One commonly used public-key cryptography method is the ______ algorithm.

A) RSS
B) RAS
C) RSA
D) RAA

Answer: C