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Which of the following is NOT a property of the Rijndae…

Which of the following is NOT a property of the Rijndael block cipher algorithm?

PrepAway - Latest Free Exam Questions & Answers

A.
The key sizes must be a multiple of 32 bits

B.
Maximum block size is 256 bits

C.
Maximum key size is 512 bits

D.
The key size does not have to match the block size

Explanation:
The maximum key size is 256 bits, not 512 bits.
Rijndael is a block symmetric cipher that was chosen to fulfill the Advanced Encryption Standard. It uses a 128-
bit block size and various key lengths (128, 192, 256).
The Rijndael specification is specified with block and key sizes that may be any multiple of 32 bits, both with a
minimum of 128 and a maximum of 256 bits.
Incorrect Answers:
A: It is true that the key sizes must be a multiple of 32 bits.
B: It is true that the maximum block size is 256 bits.
D: It is true that the key size does not have to match the block size.

http://searchsecurity.techtarget.com/definition/Rijndael
https://en.wikipedia.org/wiki/Advanced_Encryption_Standard
Krutz, Ronald L. and Russel Dean Vines, The CISSP Prep Guide: Mastering the Ten Domains of Computer
Security, John Wiley & Sons, New York, 2001, p. 145


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