Which of the following statements related to a private key cryptosystem is FALSE?

Which of the following statements related to a private key cryptosystem is FALSE?

A.
The encryption key should be secure

B.
Data Encryption Standard (DES) is a typical private key cryptosystem

C.
The key used for decryption is known to the sender

D.
Two different keys are used for the encryption and decryption

Explanation:
“In symmetric key cryptography, a single secret key is used between entities,
wheareas in public key systems, each entity has different keys, or asymmetric keys.” Pg 476 Shon

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