Cryptography C839 Set 1. Exam Questions and answers. Graded A+

Cryptography C839 Set 1. Exam Questions and answers. Graded A+ Which block cipher modes can be used to turn a block cipher into a stream cipher? Select two. Counter Mode CTR and Output Feedback Mode OFB What are reasons certificates should have an expiration date? Select all that apply 1 Decreases risk of compromise 2 To facilitate recovery from compromise 3 Creates forced opportunity fo users to update certificate information. What phase of the certificate lifecycle does certificate expiration and certificate renewal reside in? Cancellation and History Phase The basic premise of the birthday paradox involves knowing the number of people you would need in room to have _____ of two people being born on the same month and day. Strong likelihood The birthday paradox concept is employed in the birthday attack on hashes in effort to identify _____ of a given hash. a collision In applying the birthday paradox, with a room containing 23 people, what is the likelihood two of those 23 people were born on the same month and day? Fifty-fifty What is the basic path for certificate requests from a user? User Registration Authority Certificate Authority Which National Security Agency (NSA) type is Skipjack classified as? Type 2