WGU Course C839 - Intro to Cryptography Q&A 2022/2023

What type of encryption uses different keys to encrypt and decrypt the message? - Answer- Asymmetric The most widely used asymmetric encryption algorithm is what? - Answer- RSA Original, unencrypted information is referred to as ____. - Answer- plaintext Which of the following is not an asymmetric system? - Answer- 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? - Answer- User B's public key The greatest weakness with symmetric algorithms is _____. - Answer- The problem of key exchange Which of the following is generally true about block sizes? - Answer- Larger block sizes increase security A _____ is a function that takes a variable-size input m and returns a fixed-size string. - Answer- Hash Which of the following is a cryptographic protocol that allows two parties to establish a shared key over an insecure channel? - Answer- Diffie-Hellman A _________ is a digital representation of information that identifies you as a relevant entity by a trusted third party? - Answer- Digital Signature What is the standard used by most digital certificates? - Answer- X.509 DES uses keys of what size? - Answer- 56 bits Which of the following is not a key size used by AES? - Answer- 512 bits Which of the following was a multi alphabet cipher widely used from the 16th century to the early 20th century? - Answer- Vigenere Which of the following is a substitution cipher used by ancient Hebrew scholars? - Answer- Atbash The technique of moving a given letter a fixed number of spaces to the right or left is called what? - Answer- Single substitution