4-24 Crypto Primer

Question 1

What is cryptography?

Answer 1

Conversion of communication into a form that can only be read by the intended recipient

Question 2

What are some crypto use cases?

Answer 2

Encryption for confidentiality, hashing for integrity, digital signatures for authenticity and non-reputation and digital certificates for authentication.

Question 3

What is a cipher?

Answer 3

Technique that transforms plain tax into cipher text and back to plain text

Question 4

What is the stream cipher and a block cipher?

Answer 4

Stream cipher works on a bit of data at a time using XOR functions while a block cipher works on blocks of data simultaneously

Question 5

In cryptography, what is confusion and diffusion

Answer 5

Confusion is the process of changing values in a cipher while diffusion is the process of changing the order of values of a cipher sending bits through multiple rounds of transposition is used to create diffusion

Question 6

What is the strength of a crypto system?

Answer 6

Combination of the algorithm, the algorithmic process, the length of the key and the secrecy of the key