Cryptography (SEC-310-0) QUESTION AND ANSWERS 100%

Selected Answer: Answers: Asymmetric encryption Symmetric encryption Data integrity algorithms Asymmetric encryption Authentication protocols Question 8 2 out of 2 points The essential elements of any pseudorandom number generator are a and a deterministic algorithm for generating a stream of pseudorandom bits. Selected Answer: Answers: seed value secret key session key seed value stream encryption function Question 9 2 out of 2 points The indicates that the subscriber identified in the certificate has sole control and access to the private key Selected Answer: Answers: Public Key Certificate OAEP Digital Signature Public Key Certificate PKI Question 10 2 out of 2 points The first row of State is not altered; for the second row a 1-byte circular left shift is performed; for the third row a 2-byte circular left shift is performed; and for the fourth row a 3-byte circular left shift is performed. This transformation is called . Selected Answer: Answers: Question 11 ShiftRows AddRoundKey MixColumns Substitute bytes ShiftRows 2 out of 2 points A attack involves trying every possible key until an intelligible translation of the ciphertext is obtained. Selected Answer: Answers: brute-force brute-force Caesar attack ciphertext only chosen plaintext Question 12 2 out of 2 points A public-key encryption scheme has ingredients. Selected Answer: Answers: four six six eight two Question 13 2 out of 2 points is a mechanism or service used to verify the integrity of a message. Selected Answer: Answers: Message authentication Message authentication Data compression Data mapping Message digest Question 14 2 out of 2 points is a security enhancement to the MIME Internet email format standard based on technology from RSA Data Security. Selected Answer: Answers: S/MIME S/MIME SPF DKIM HTTPS Question 15 2 out of 2 points A common technique for masking contents of messages or other information traffic so that opponents can not extract the information from the message is . Selected Answer: Answers: encryption integrity encryption analysis masquerade Question 16 2 out of 2 points The Secure Hash Algorithm design closely models, and is based on, the hash function . Selected Answer: Answers: Question 17 MD4 MD5 FIPS 180 RFC 4634 MD4 2 out of 2 points The protocol enables two users to establish a secret key using a public-key scheme based on discrete logarithms. Selected Answer: Answers: Diffie-Hellman Micali-Schnorr Elgamal-Fraiser Diffie-Hellman Miller-Rabin Question 18 2 out of 2 points Asymmetric encryption is also known as . Selected Answer: Answers: public-key encryption public-key encryption private-key encryption optimal-key encryption secret-key encryption Question 19 2 out of 2 points In the general structure of the AES encryption process the input to the encryption and decryption algorithms is a single block. Selected Answer: Answers: 128-bit 32-bit 64-bit 128-bit 256-bit Question 20 2 out of 2 points The most widely used public-key cryptosystem is . Selected Answer: Answers: RSA optimal asymmetric encryption asymmetric encryption RSA AES Question 21 2 out of 2 points is an open-source, freely available software package for e-mail security which has essentially the same functionality as S/MIME. Selected Answer: PGP Correct Answer: Pretty Good Privacy (PGP) Question 22 2 out of 2 points depend on the running time of the decryption algorithm. Selected Answer: Answers: Timing attacks Mathematical attacks Timing attacks Chosen ciphertext attacks Brute-force attacks Question 23 2 out of 2 points The AES cipher begins and ends with a(n) stage because any other stage,applied at the beginning or end, is reversible without knowledge of the key and would add no security. Selected Answer: Answers: AddRoundKey Substitute bytes AddRoundKey MixColumns ShiftRows Question 24 2 out of 2 points A technique referred to as a is a mapping achieved by performing some sort of permutation on the plaintext letters. Selected Answer: Answers: Transposition cipher Transposition cipher Polyalphabetic cipher Monoalphabetic cipher Caesar cipher Question 25 2 out of 2 points A is an algorithm that requires the use of a secret key. Selected Answer: Answers: MAC DAA SHA GCM MAC Question 26 2 out of 2 points involves the passive capture of a data unit and its subsequent retransmission to produce an unauthorized effect. Selected Answer: Answers: Replay Disruption Replay Service denial Masquerade Question 27 2 out of 2 points Asymmetric encryption can be used for . Selected Answer: Answers: both confidentiality and authentication confidentiality both confidentiality and authentication authentication neither confidentiality and authentication Question 28 2 out of 2 points If a secret key is to be used as a for conventional encryption a single number must be generated. Selected Answer: Answers: session key discrete logarithm prime curve session key primitive root Question 29 2 out of 2 points S/MIME cryptographic algorithms use to specify requirement level. Selected Answer: Answers: SHOULD and MUST CAN and MUST SHOULD and CAN SHOULD and MIGHT SHOULD and MUST Question 30 2 out of 2 points (Extra Credit) Decrypt this cypher-text using Playfair. The key is wildcats. GWQWWOFTITCBPQQGMZAYHFBWASMSBAFVXBOCLMSGARZTFTEHBWASMSHRBU Selected Answer: Correct Answer: FINDING A VIDEO POKER BUG MADE THESE GUYS RICH THEN VEGAS MADE THEM PAY Finding a Video Poker Bug Made These Guys Rich—Then Vegas Made Them Pay Question 31 2 out of 2 points The key exchange protocol is vulnerable to a attack because it does not authenticate the participants. Selected Answer: Answers: man-in-the-middle one-way function time complexity chosen ciphertext man-in-the-middle Question 32 2 out of 2 points "Given a hash function H, with n possible outputs and a specific value H(x), if H is applied to k random inputs, what must be the value of k so that the probability that at least one input y satisfies H(y) = H(x) is 0.5" is a reference to the . Selected Answer: Answers: birthday attack authentication code collision resistant birthday attack big endian Question 33 2 out of 2 points A takes place when one entity pretends to be a different entity. Selected Answer: Answers: