Question

Which of the following statements about symmetric key cryptography is not true?

A: Symmetric key cryptography uses one shared key.
B: Symmetric algorithms can provide confidentiality.
C: Symmetric algorithms can provide nonrepudiation and authenticity.
D: Symmetric key cryptography uses a single secret key.

Answer 1

The statement that is not true about symmetric key cryptography is C: Symmetric algorithms can provide nonrepudiation and authenticity.

Step-by-step explanation:

The statement that is not true about symmetric key cryptography is C: Symmetric algorithms can provide nonrepudiation and authenticity.

Symmetric key cryptography uses one shared key (option A) and a single secret key (option D) to encrypt and decrypt data. Symmetric algorithms are primarily used for providing confidentiality (option B) where the message is encoded in such a way that only the intended recipients can read it. However, symmetric key cryptography does not inherently provide nonrepudiation and authenticity of the message.