WGU C839 Exam Questions and answers, Graded A+. VERIFIED.

WGU C839 Exam Questions and answers, Graded A+. VERIFIED. Which encryption standard is approved by the National Security Agency (NSA) for classified information? Advanced Encryption Standard (AES Which National Security Agency (NSA) encryption algorithms are unevaluated commercial cryptographic components? Type 4 Which method is used to verify the validity of a certificate? Online Certificate Status Protocol (OCSP) What is used to protect an encryption key and deliver it quickly? Digitally signed symmetrical key encryption sent via email Why should a certificate authority (CA) assign an expiration date for certificates it issues? A certificate with a short life span limits how long data is vulnerable if the key is compromised What is used as a virtual representation that identifies a person as an entity by a trusted third party? Digital signature Which attribute is common to stream ciphers? XORing pseudo-random bytes with plaintext Which mode generates a pseudo-random stream of bytes and XORs the plaintext while encrypting? Output feedback (OFB) What is a common attribute of a streaming algorithm? It encrypts a bit at a time. What is required to decrypt data encrypted by a symmetric key? An identical copy of the key Which sender-identifying input must be provided when digitally signing a message? Public key What does m represent, assuming that the encryption function is described by the equation c=E(Ke, m)? Plaintext A forensic investigator discovers a message encrypted with the Caesar cipher+2? Vgp