WGU Intro to Cyptography-Practice Test Questions With Complete Solutions.

What type of encryption uses different keys to encrypt and decrypt the message? - asymmetric The most widely used asymmetric encryption algorithm is what? - RSA Original, unencrypted information is referred to as _____. - plaintext Which of the following is NOT an asymmetric system? - 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? - User B's public key The greatest weakness with symmetric algorithms is _______. - the problem of key exchange Which of the following is generally true about block ciphers? - The plaintext and ciphertext are always the same size. A _______ is a function that takes a variable-size input m and returns a fixed-size string. - hash Which of the following is a cryptographic protocol that allows two parties to establish a shared key over an insecure channel? - Diffie-Hellman A _______ is a digital representation of information that identifies you as a relevant entity by a trusted third party? - digital signature What is the standard used by most digital certificates? - X.509 DES uses keys of what size? - 56 bitsWhich of the following is NOT a key size used by AES? - 512 bits Which of the following was a multi alphabet cipher widely used from the 16th century (1553) to the early 20th century (1900s)? - Vigenere Which of the following is a substitution cipher used by ancient Hebrew scholars? - Atbash