Deck 6: Cryptography

Question 1

A key is a parameter that controls the transformation of plaintext into ciphertext or vice versa.

Answer 1

True

Question 2

Substitution is also referred to as permutation.

Answer 2

False

Question 3

Julius Caesar created the scytale cipher.

Answer 3

False

Question 4

The Caesar cipher and the Vigenere cipher are two of the earliest forms of substitution ciphers.

Question 5

In a hybrid cipher, the asymmetric algorithm provides the keys used for encryption.

Question 6

DES and 3DES are symmetric algorithms.

Question 7

Diffie-Hellman provides secure key distribution, confidentiality,
authentication, and nonrepudiation.

Question 8

The U.S. government requires the usage of SHA-2 instead of MD5.

Question 9

The U.S. federal government requires the use of DSA, RSA, or Elliptic Curve DSA (ECDSA) and SHA for digital signatures.

Question 10

Secure Sockets Layer (SSL) is a transport layer protocol that provides encryption, server and client authentication, and message integrity.

Question 11

Which term is used for a message in its original format?

A) Encryption
B) Decryption
C) Ciphertext
D) Plaintext

Question 12

Which term is used for the amount of time and resources that would be needed to break the encryption?

A) Confusion
B) Avalanche affect
C) Work factor
D) Trapdoor

Question 13

Which cipher uses 27 shift alphabets with letters being shifted up one place?

A) Scytale cipher
B) Vigenere cipher
C) Caesar cipher
D) World War II Enigma

Question 14

What is another term for a null cipher?

A) Concealment cipher
B) Substitution cipher
C) Running key cipher
D) Transposition cipher

Question 15

Which of the following is the most secure encryption scheme that can be used?

A) Symmetric cipher
B) One-way hash
C) Steganography
D) One-time pad

Question 16

Which of the following is NOT a symmetric algorithm?

A) CAST
B) IDEA
C) RSA
D) Twofish

Question 17

What should you implement to prevent man-in-the-middle attacks against the Diffie-Hellman algorithm?

A) One-way hash
B) Digital certificates
C) Zero Knowledge Proof
D) Private keys

Question 18

Which hash function produces 128-, 160-, or 192-bit hash values after performing 24 rounds of computations on 512-bit blocks?

A) Tiger
B) HAVAL
C) SHA-2
D) MAC

Question 19

Which entity creates and signs digital certificates, maintains the certificates, and revokes them when necessary?

A) CRL
B) OCSP
C) RA
D) CA

Question 20

Which of the following is NOT an e-mail standard?

A) MIME
B) S/MIME
C) IPsec
D) PGP