What block size is defined for AES 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

What block size is defined for AES in FIPS 197?

Explanation:
AES uses a fixed block size of 128 bits. This is defined in FIPS 197, so each plaintext block is 16 bytes long. The key size can be 128, 192, or 256 bits, but the block size remains 128 bits. This is different from DES, which uses 64-bit blocks. In AES, that 128-bit block is processed as a 4x4 byte matrix in the internal state during encryption and decryption.

AES uses a fixed block size of 128 bits. This is defined in FIPS 197, so each plaintext block is 16 bytes long. The key size can be 128, 192, or 256 bits, but the block size remains 128 bits. This is different from DES, which uses 64-bit blocks. In AES, that 128-bit block is processed as a 4x4 byte matrix in the internal state during encryption and decryption.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy