Symmetric keys a. allow the same algorithm to be used to ...

[clippers!]

Symmetric keys
 
  a. allow the same algorithm to be used to encrypt and decrypt data
  b. require the same key to be used by sender and receiver
  c. require that the algorithm changes for each transmission
  d. can be used in public key systems

Question 2

DES is an encryption standard
 
  a. adopted by the NIST
  b. also known as the DEA
  c. sometimes used to secure financial transactions
  d. all of the above

[daiying98]

Answer to Question 1

b

Answer to Question 2

d