Chapter 4 - AES Question and answers 100% correct 2023/2024

Chapter 4 - AES Question and answers 100% correct 2023/2024 AES (Advanced Encryption Standard) - correct answer -most widely used symmetric cipher today -algorithm chosen by US NIST (Rijndael) -block cipher with 128-bit block size -3 supported key lengths: 128, 192, 256 bits -efficient in software and hardware -iterated cipher with 10/12/14 rounds -starts with key addition (128 bit sukey XORed to the state) -each round consists of "layers" -byte substitution layer -diffusion layer (shift rows, mix columns) -key addition - correct answer describe AES process -byte oriented cipher -state A (128 bit data chunk) can be arranged in 4x4 matrix with A0-15 denoting 16-byte input of AES - correct answer describe internal structure of AES byte, bit - correct answer AES steps are ___-oriented while DES is ___-oriented (byte or bit) AES - correct answer steps of ____: -round function for rounds 1 to n-1 -substitution -byte-wise permutation