True or False? Revocation is a security measure that stops authorization for access to data.

Group of answer choices

True

False

Flag question: Question $22$

Question $224$ pts

Some ciphers, regardless of type, rely on the difficulty of solving certain mathematical problems, which is the basis for asymmetric key cryptography. Which of the following is a branch of mathematics that involves multiplicative inverses that these ciphers use?

Group of answer choices

Factoring small numbers

Subset sum problems

Quantum physics

Field theory

Flag question: Question $23$

Question $234$ pts

True or False? With asymmetric key ciphers, it is computationally infeasible to derive the second algorithm from the first algorithm.

Group of answer choices

True

False

Flag question: Question $24$

Question $244$ pts

Which of the following is not true of hash functions?

Group of answer choices

Hash functions help detect forgeries by computing a checksum of a message and then combining it with a cryptographic function so that the result is tamperproof.

The hashes produced by a specific hash function may vary in size.

A hash is a checksum designed so that no one can forge a message in a way that will result in the same hash as a legitimate message.

The output from the message digest algorithm $($MD$5)$ or the Secure Hash Algorithm $($SHA$)$ hash provides input for an asymmetric key algorithm that uses a private key as input.

Flag question: Question $25$

Question $254$ pts

What is not a symmetric encryption algorithm?

Group of answer choices

Diffie$$Hellman

Data Encryption Standard $($DES$)$

International Data Encryption Algorithm $($IDEA$)$

Carlisle Adams Stafford Tavares $($CAST$)$