All the Following Statements About Symmetric Key Cryptography Are True

Multiple Choice

All the following statements about symmetric key cryptography are true except:

A) in symmetric key cryptography, both the sender and the receiver use the same key to encrypt and decrypt a message.
B) the Data Encryption Standard is a symmetric key encryption system.
C) symmetric key cryptography is computationally slower.
D) symmetric key cryptography is a key element in digital envelopes.