Symmetric Encryption

Question 1

What are other names for symmetric Encryption ?

Answer 1

conventional encryption or single-key encryption

Question 2

What is symmetric encryption?

Answer 2

The method by which information is
converted into secret code that hides the information’s true meaning using Keys made up of exactly similar parts.

Question 3

What are the two requirements for secure use of symmetric encryption?

Answer 3

1.Need a strong encryption algorithm
2. Sender and receiver must have obtained copies of
the secret key in a secure fashion and must keep
the key secure.

Question 4

What are the 5 ingredients of a symmetric encryption scheme

Answer 4

1. Plaintext
2. Encryption algorithm
3. Secret key
4. Ciphertext
5. Decryption algorithm

Question 5

What are the two general approaches to attacking a
symmetric encryption scheme

Answer 5

1. Cryptanalysis
   Cryptanalytic attacks rely on the nature of the algorithm
   plus perhaps some knowledge of the general
   characteristics of the plaintext or even some sample
   plaintext-ciphertext pairs.
2. Brute-Force Attacks: to
   try every possible key on a piece of ciphertext until an
   intelligible translation into plaintext is obtained.

Question 6

True or false

If the cryptanalysis attack succeeds in deducing the key, all future and past messages encrypted with that key
are compromised.

Answer 6

True