WGU C839 Exam Study Questions and Answers 2023 - 2024 (Verified Answers) 1.Which encryption standard is approved by the National Security Agency (NSA) for classified information ANS Advanced Encryption Standard (AES 2.Which National Security Agency (NSA) encryption algorithms are uneval- uated commercial cryptographic components ANS Type 4 3.Which method is used to verify the validity of a certificate ANS Online Certifi- cate Status Protocol (OCSP) 4.What is used to protect an encryption key and deliver it quickly ANS Digitally signed symmetrical key encryption sent via email 5.Why should a certificate authority (CA) assign an expiration date for certificates it issues ANS A certificate with a short life span limits how long data is vulnerable if the key is compromised 1 / 2
6.What is used as a virtual representation that identifies a person as an entity by a trusted third party ANS Digital signature 7.Which attribute is common to stream ciphers ANS XORing pseudo- random bytes with plaintext 8.Which mode generates a pseudo-random stream of bytes and XORs the plaintext while encrypting ANS Output feedback (OFB) 9.What is a common attribute of a streaming algorithm ANS It encrypts a bit at a time.
10.What is required to decrypt data encrypted by a symmetric key ANS An identical copy of the key 11.Which sender-identifying input must be provided when digitally signing a message ANS Public key 12.What does m represent, assuming that the encryption function is
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