Exam 350-701 topic 1 question 31 discussion

B and D are correct

B. AES is more secure than 3DES. D. AES can use a 256-bit key for encryption. AES (Advanced Encryption Standard) is a widely used symmetric-key encryption algorithm that is considered to be more secure than its predecessor, 3DES (Triple Data Encryption Standard). AES uses a fixed block size of 128 bits and support key sizes of 128,192, and 256 bits. AES is considered to be more secure than 3DES because it uses a larger block size and key size, which makes it more resistant to brute-force attacks. AES uses a complex substitution-permutation network (SPN) structure which is more secure than the Feistel network of 3DES. Option A is not correct because AES is more secure than 3DES. Option C is not correct because AES does not support a 168-bit key size. Option E is not correct because AES uses only one round of encryption and decryption, not three times. AES-128, AES-192, and AES-256 are the valid key sizes for AES. The block size is always fixed at 128-bit.

Correct, It's BD Reference : https://en.wikipedia.org/wiki/Advanced_Encryption_Standard