Introduction to Cryptography - C839 - ECES EC-Council Certified Encryption Specialist Practice Exam

1. How did the ATBASH cipher work? - correct answer By substituting each letter for the letter from the opposite end of the alphabet (i.e. Abecomes Z, B becomes Y, etc.) 2. DES has a key space of what? - correct answer 2^56 3. Which of the following are valid key sizes for AES (choose three)? - correct answer c. 128 d. 192 e. 256 4. Which of the following algorithms uses three different keys to encrypt the plain text? - correct answer 3DES Triple Data Encryption System 5. Which of the following is a block cipher? - correct answer AES The Advanced Encryption Standard (AES) is a symmetric-key block cipher algorithm and U.S. government standard for secure and classified data encryption and decryption. 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? - correct answer Asymmetric 7. Which of the following is an asymmetric cipher? - correct answer RSA