Encryption and Steganography

Question 1

What part of the CIA triad does Encryption cover?

Answer 1

Confidentiality

Question 2

What is Encryption?

Answer 2

The process of encoding information. This process converts the original representation of the information, known as plaintext, into an alternative form known as ciphertext. Ideally, only authorized parties can decipher a ciphertext back to plaintext and access the original information.

Question 3

Name two types of Ciphers.

Answer 3

Stream and Block

Question 4

What is a Stream Cipher?

Answer 4

A cipher that encrypts data by byte.

Question 5

What is a Block Cipher?

Answer 5

A cipher that encrypts data by block (64-bits and higher).

Question 6

What are the benefits of using a stream cipher over a block cipher?

Answer 6

It is faster.

Question 7

What are the benefits of using a block cipher over a stream cipher?

Answer 7

It is more secure and more difficult to reverse.

Question 8

Name some types of encryption.

Answer 8

Electronic Code Book: Weakest
Cipher Block Chaining: Errors affect whole chain
Cipher Feedback (CFB): Works like stream cipher
Output Feedback (OFB): Works like stream cipher
Counter Mode (CTR): Strongest

Question 9

What is Steganography?

Answer 9

A process in which someone hides messages in images, audio, or video. It can be used to communicate secret messages in plain sight.