ECES

1. How did the ATBASH cipher work? a. By shifting each letter a certain number of spaces b. By Multi alphabet substitution c. By rotating text a given number of spaces d. By substituting each letter for the letter from the opposite end of the alphabet (i.e. A becomes Z, B becomes Y, etc.) CORRECT ANSWERS: D 2. DES has a key space of what? a. 2^128 b. 2^192 c. 2^56 d. 2^64 CORRECT ANSWERS: C 3. Which of the following are valid key sizes for AES (choose three)? a. 56 b. 64 c...

What type of encryption uses different keys to encrypt and decrypt the message? CORRECT ANSWERS: Asymmetric The most widely used asymmetric encryption algorithim is what? CORRECT ANSWERS: RSA Original, unencrypted information is referred to as ____. CORRECT ANSWERS: Plaintext Which of the following is not an asymmetric system? CORRECT ANSWERS: DES In order for User A to send User B an encrypted message that only User B can read, User A must encrypt message with which of the follo...