Exam 350-701 topic 1 question 30 discussion

C and D are the correct Answers. AES always uses a fixed block size of 128 bits (16 bytes). This is true for all AES variants (AES-128, AES-192, AES-256).

C and D are correct

C. 128-bit block size, 192-bit key length D. 128-bit block size, 256-bit key length AES (Advanced Encryption Standard) is a symmetric-key encryption algorithm that supports several key and block sizes. The most commonly used key sizes for AES are 128-bit, 192-bit, and 256-bit. The block size is always fixed at 128-bit. AES-128 uses a 128-bit key length and 128-bit block size AES-192 uses a 192-bit key length and 128-bit block size AES-256 uses a 256-bit key length and 128-bit block size Option A and B are not correct because AES does not support 64-bit block size. Option E is not correct because AES does not support 192-bit block size AES-128, AES-192, and AES-256 are the valid key sizes for AES. The block size is always fixed at 128-bit.

128 block size is defined in the AES standard

correct, It's CD