Chap 1 and 2

Question 1

Cryptanalysis

Answer 1

Technique of decoding messages from a non-
readable format back to readable format
without knowing how they were initially
converted from readable format to non-
readable format

Question 2

Minimum bit size for Symmetric and Asymmetric Encryption

Answer 2

256 and 2048 bits

Question 3

Cryptography

Answer 3

Art of achieving security by encoding a message from a readable format to non-readable format

Question 4

Order of hardest to easiest attack

Answer 4

Known Cipher text
Known plaintext
Chosen plaintext
Chosen ciphertext
Chosen text

Question 5

Confusion vs Diffusion

Answer 5

Confusion - protect relationship between ciphertext and key
Diffusion - protect relationship between ciphertext and plaintext

Question 6

Confidentiality

Answer 6

Assurance that only authorized parties or intended recipients have access to certain info

Question 7

Authentication

Answer 7

Assures the identity of all communicating parties and identify sender and receiver of the message.

Question 8

Integrity

Answer 8

Assures that message has not been modified by unauthorized parties

Question 9

Availability

Answer 9

Assures that user authentication systems are always available

Question 10

Non-repudiation

Answer 10

Assures the non-deniability of communications

Question 11

Access control

Answer 11

Defines who can access what
Access control matrix
Access control list

Question 12

Active attacks

Answer 12

Modification of original message or send false message
Modification - Replay attack, alteration
Denial of service - DDOS
Fabrication - attack on authentication

Question 13

Problems with symmetric key encryption

Answer 13

1. How can we distribute the keys securely
2. Many keys need to be used
3. Key management

Question 14

How to prevent DFH MITM attack

Answer 14

Both parties must mutually authenticate with one another before exchanging information