Question

Mars, RC6, serpent and Twofish are cryptopgarphic algorithms:

a. required as part of AES standard.
b. that were competitors of Rijndael for AES.
c. that are written for cryptocurrencies such as bitcoin.
d. that were part of AES before Rijndael.

Answer 1

b. that were competitors of Rijndael for AES.

Step-by-step explanation:

In 1999, the National Institute of Standards and Technology of the United States (NIST), announced their five finalists for the post of Advanced Encryption Standard (AES) which included, alongside the winner Rijndael, Mars, RC6, serpent and Twofish.

Therefore, the answer is b. that were competitors of Rijndael for AES.