ECES-Practice Test Questions with complete solutions

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 following keys? CORRECT ANSWERS: User B's public key The greatest weakness with symmetric algorithms is ____. CORRECT ANSWERS: The problem of key exchange Which of the following is generally true about block sizes? CORRECT ANSWERS: Larger block sizes increase security A ____ is a function that takes a variable-size input m and returns a fixed-size string. CORRECT ANSWERS: Hash Which of the following is cryptographic protocol that allows two parties to establish a shared key over an insecure channel? CORRECT ANSWERS: Diffie-Hellman A ____ is a digital representation of information that identifies you as a relevant entity by a trusted third party? CORRECT ANSWERS: Digital Signature What is the standard used by most digital certificates? CORRECT ANSWERS: X.509 DES uses keys of what size? CORRECT ANSWERS: 56 bits Which of the following is not a key size used by AES? CORRECT ANSWERS: 512 bits Which of the following was a multi alphabet cipher widely used from the 16th century (1553) to the early 20th century (1900s)? CORRECT ANSWERS: Vigenere Which of the following is a substitution cipher used by ancient Hebrew scholars? CORRECT ANSWERS: Atbash Shifting each letter in the alphabet a fixed number of spaces to the right or left is an example of what? CORRECT ANSWERS: Single substitution Which of the following most accurately defines encryption? CORRECT