What type of algorithm does AES encryption use?(a) Stream cipher(b) Symmetric block cipher(c) Asymmetric caesar cipher(d) DES encryptionI have been asked this question in examination.My question is from Cryptography topic in section Number Theory and Cryptography of Discrete Mathematics

What type of algorithm does AES encryption use?(a) Stream cipher(b) Sy

1.	What type of algorithm does AES encryption use?(a) Stream cipher(b) Symmetric block cipher(c) Asymmetric caesar cipher(d) DES encryptionI have been asked this question in examination.My question is from Cryptography topic in section Number Theory and Cryptography of Discrete Mathematics
Answer» The CORRECT choice is (b) Symmetric block cipher To elaborate: AES encryption USES symmetric block ciphers to encrypt the messages. It is at least 6 times FASTER than 3 DES. AES uses a substitution-permutation network and this network is a series of operations that either replaces input with output bits (substitution) or shuffles the bits (permutation). It uses 128-bit input PLAINTEXT and it operates on bytes rather than bits. Here, the input is represented as 16 bytes (because 128 bits = 16 bytes) and is arranged in a 4 x 4 MATRIX.

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