lesson 9

What is NOT a valid encryption key length for use with the Blowfish algorithm?

512 bits

Which information security objective allows trusted entities to endorse information?

Certification

What mathematical problem forms the basis of most modern cryptographic algorithms?

Factoring large primes

Gary is sending a message to Patricia. He wants to ensure that nobody tampers with the message while it is in transit. What goal of cryptography is Gary attempting to achieve?

Integrity

What is NOT a symmetric encryption algorithm?

Rivest-Shamir-Adelman (RSA)

Which set of characteristics describes the Caesar cipher accurately?

Symmetric, stream, substitution

Product cipher is an encryption algorithm that has no corresponding decryption algorithm

false

What type of function generates the unique value that corresponds to the contents of a message and is used to create a digital signature?

hash

Alice would like to send a message to Bob using a digital signature. What cryptographic key does Alice use to create the digital signature?

Alice's private key

Bob received a message from Alice that contains a digital signature. What cryptographic key does Bob use to verify the digital signature?

Alice's public key

Which cryptographic attack offers cryptanalysts the most information about how an encryption algorithm works?

Chosen plaintext

Betty receives a ciphertext message from her colleague Tim. What type of function does Betty need to use to read the plaintext message?

Decryption

Alice and Bob would like to communicate with each other using a session key but they do not already have a shared secret key. Which algorithm can they use to exchange a secret key?

Diffie-Hellman

Which approach to cryptography provides the strongest theoretical protection?

Quantum cryptography

Which type of cipher works by rearranging the characters in a message?

Transposition

What is the only unbreakable cipher when it is used properly?

Vernam

When Patricia receives a message from Gary, she wants to be able to demonstrate to Sue that the message actually came from Gary. What goal of cryptography is Patricia attempting to achieve?

Nonrepudiation

A salt value is a set of random characters you can combine with an actual input key to create the encryption key.

true

A substitution cipher replaces bits, characters, or blocks of information with other bits, characters, or blocks.

true

Which of the following allows a certificate authority (CA) to revoke a compromised digital certificate in real time?

Online Certificate Status Protocol (OCSP)