Question $8(2$ points$)$

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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$)$ symmetric key cryptography is still part of Internet cryptography.

C$)$ The Data Encryption Standard is the most widely used symmetric key encryption system.

D$)$ There are symmetric key systems that have keys up to $2,048$ bits.