ECES Cryptography Practice questions with complete solutions
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. 128 d. 192 e. 256 f. 512 CORRECT ANSWERS: C, D, E 4. Which of the following algorithms uses three different keys to encrypt the plain text? a. AES b. 3DES c. Blowfish d. Skipjack CORRECT ANSWERS: B 5. Which of the following is a block cipher? a. AES b. RC4 c. DH d. RSA CORRECT ANSWERS: A 6. Which of the following is a type of encryption that has two different keys. One key can encrypt the message and the other key can only decrypt it? a. Symmetric b. Asymmetric
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ECES
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eces cryptography practice questions with complete solutions
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