Which key size is NOT specified as an AES option in FIPS 197?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $25.99Unlock all

Study for the WGU ITAS 2142 D830 Introduction to Cryptography Exam. Review flashcards and multiple choice questions with hints and explanations. Get ready for your exam!

Multiple Choice

Which key size is NOT specified as an AES option in FIPS 197?

Explanation:
AES, as defined in FIPS 197, uses three key lengths: 128, 192, and 256 bits. These sizes were chosen to match the fixed 128-bit block structure and the corresponding number of rounds: 10 rounds for 128-bit keys, 12 rounds for 192-bit keys, and 14 rounds for 256-bit keys. A 512-bit key is not part of the AES specification; accommodating it would require a different block/key structure and a new set of rounds that the standard does not define. So 512-bit keys are not an option in the AES standard.

AES, as defined in FIPS 197, uses three key lengths: 128, 192, and 256 bits. These sizes were chosen to match the fixed 128-bit block structure and the corresponding number of rounds: 10 rounds for 128-bit keys, 12 rounds for 192-bit keys, and 14 rounds for 256-bit keys. A 512-bit key is not part of the AES specification; accommodating it would require a different block/key structure and a new set of rounds that the standard does not define. So 512-bit keys are not an option in the AES standard.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy