Encryption

Question 1

What are the attributes in encryption?

Answer 1

1. Plain text
2. Hasing function
3. Key
4. Cipher text

Question 2

What are the information security objectives?

Answer 2

1. Confidentiality
2. Integrity
3. Availability
4. Auditability

Question 3

What are the elements of access control?

Answer 3

1. Identification
2. Authentication
3. Authorization
4. Nonrepudiation

Question 4

What is symmetric key cryptography?

Answer 4

In symmetric key cryptography, key k is used both for encryption (E) of plain text m and for decryption (d) of cipher text c

Question 5

What are the problems related to symmetric key cryptography?

Answer 5

1. Key distribution
2. Secrecy
3. Usability
4. Storage

Question 6

How is public key cryptography different compared to symmetric cryptography?

Answer 6

A pair of two related keys (PK, SK) are used and it does not matter if someone intercepts PKb because it is public

Question 7

What are the advantages of public key cryptography?

Answer 7

1. Users do not have to know each other
2. Key management
3. Electronically signed messages

Question 8

Which methods are based on SP networks?

Answer 8

1. AES
2. DES
3. 3DES

Question 9

How do block ciphers work?

Answer 9

They use confusion (adding unknown key values) and diffusion

Question 10

How does the Feistel cipher work?

Answer 10

It contains a ladder structure and input is split up into two blocks both containing a function, left half and right half,

Question 11

Why do we have 3DES?

Answer 11

Because the key in DES was too short

Question 12

Which type of encryption are out there?

Answer 12

Biometric
End-to-end
Quantum
Homomorphic
Blockchain

Question 13

What is homomorphic encryption?

Answer 13

Fast transmission of highly classified material while keeping material highly secured

Question 14

What is beneficial about blockchain?

Answer 14

1. Reduced costs
2. No verification needed
3. Decreased computing load