Which of the following algorithms is not an example of a symmetric encryption algorithm?
a. Rijndael
b. Diffie-Hellman
c. RC6
d. AES
Answer: B
Diffie-Hellman uses public and private keys, so it is considered an asymmetric encryption algorithm. Because Rijndael and Advanced Encryption Standard (AES) are now one in the same, they both can be called symmetric encryption algorithms; therefore, answers A and D are incorrect. Answer C is incorrect because RC6 is symmetric, too.
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Cryptography Basics
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