Chapter 6 Questions

Which of the following is not to be decrypted but is only used for comparison purposes? 1. Digest 2. Key 3. Stream 4. Algorithm

Answer: 1. Digest

What is data called that is to be encrypted by inputting it into a cryptographic algorithm? 1. Plaintext 2. Byte-text 3. Cleartext 4. Ciphertext

Answer: 1. Plaintext

What is a collision? 1. Two files produce the same digest. 2. Two ciphertexts have the same length. 3. Two algorithms have the same key. 4. Two keys are the same length.

Answer: 1. Two files produce the same digest.

Which of these is the strongest symmetric cryptographic algorithm? 1. Data Encryption Standard 2. Advanced Encryption Standard 3. Triple Data Encryption Standard 4. RC1

Answer: 2. Advanced Encryption Standard

If Bob wants to send a secure message to Alice using an asymmetric cryptographic algorithm, which key does he use to encrypt the message? 1. Alice's private key 2. Alice's public key 3. Bob's public key 4. Bob's private key

Answer: 2. Alice's public key

Deo has been asked to explain RSA to his colleague. After his explanation, Deo is asked what, if any, weaknesses RSA has. How would Deo respond? 1. RSA has no known weaknesses. 2. As computers become more powerful, the ability to compute factoring has increased. 3. RSA weaknesses are based on ECC. 4. The digest produced by the RSA algorithm is too short to be secure.

Answer: 2. As computers become more powerful, the ability to compute factoring has increased.

Which of these is NOT a characteristic of a secure hash algorithm? 1. The results of a hash function should not be reversed. 2. Collisions should occur no more than 15 percent of the time. 3. A message cannot be produced from a predefined hash. 4. The hash should always be the same fixed size.

Answer: 2. Collisions should occur no more than 15 percent of the time.

Which of these provides cryptographic services and is external to the device? 1. Trusted Platform Module (TPM) 2. Hardware Security Module (HSM) 3. self-encrypting hard disk drives (SED) 4. encrypted hardware-based USB devices

Answer: 2. Hardware Security Module (HSM)

Which of the following is FALSE about "security through obscurity"? 1. It attempts to hide the existence from outsiders. 2. It can only provide limited security. 3. It is essentially impossible. 4. Proprietary cryptographic algorithms are an example.

Answer: 2. It can only provide limited security.

Cryptography can prevent an individual from fraudulently reneging on an action. What is this known as? 1. Repudiation 2. Nonrepudiation 3. Obfuscation 4. Integrity

Answer: 2. Nonrepudiation

Which of the following is NOT a symmetric cryptographic algorithm? 1. DES 2. SHA 3. Blowfish 4. 3DES

Answer: 2. SHA

What is low latency? 1. A low-power source requirement of a sensor. 2. The time between when a byte is input into a cryptographic cipher and when the output is obtained. 3. The requirements for an IoT device that is using a specific network. 4. The delay between when a substitution cipher decrypts the first block and when it finishes with the last block.

Answer: 2. The time between when a byte is input into a cryptographic cipher and when the output is obtained.

Egor wanted to use a digital signature. Which of the following benefits will the digital signature NOT provide? 1. Verify the sender 2. Verify the receiver 3. Prove the integrity of the message 4. Enforce nonrepudiation

Answer: 2. Verify the receiver

What are public key systems that generate different random public keys for each session? 1. Public Key Exchange (PKE) 2. perfect forward secrecy 3. Elliptic Curve Diffie-Hellman (ECDH) 4. Diffie-Hellman (DH)

Answer: 2. perfect forward secrecy

Basil was reading about a new attack that forces the system to abandon a higher cryptographic security mode of operation and instead fall back to an older and less secure mode. What type of attack is this? 1. Deprecation attack 2. Pullback attack 3. Downgrade attack 4. Obfuscation attack

Answer: 3. Downgrade attack

Which of the following is NOT a characteristic of the Trusted Platform Module (TPM)? 1. It provides cryptographic services in hardware instead of software. 2. It can generate asymmetric cryptographic public and private keys. 3. It can easily be transported to another computer. 4. It includes a pseudorandom number generator (PRNG).

Answer: 3. It can easily be transported to another computer.

Brielle is researching substitution ciphers. She came across a cipher in which the entire alphabet was rotated 13 steps. What type of cipher is this? 1. XOR 2. XAND13 3. ROT13 4. Alphabetic

Answer: 3. ROT13

Which of these is NOT a basic security protection for information that cryptography can provide? 1. Integrity 2. Authenticity 3. Risk 4. Confidentiality

Answer: 3. Risk

Cicero is researching hash algorithms. Which algorithm would produce the longest and most secure digest? 1. SHA-256 2. MD5 3. SHA3-512 4. SHA6-6

Answer: 3. SHA3-512

Which of the following hides the existence of information? 1. Encryption 2. Decryption 3. Steganography 4. Ciphering

Answer: 3. Steganography