Practical Cryptography

6ADVANCED ENCRYPTION STANDARD

ASIF UR RAHMAN, SAEF ULLAH MIAH, AND SAIFUL AZAD

Contents

Keywords

6.1 Overview

6.2 History

6.3 Design Consideration

6.4 Primitive Operations of AES

6.5 Structure of AES

6.6 Overview of Key Expansion

6.7 Key Expansion Example

6.8 Encryption

6.9 An Encryption Example

6.10 Decryption

6.11 Limitations

6.12 Pros and Cons of AES

6.13 Implementation

6.14 Conclusion

Keywords

Advanced Encryption Standard

Block cipher

6.1 Overview

The Advanced Encryption Standard (AES) is a renowned symmetric key algorithm that utilizes a same secret key to encrypt and decrypt a message. It overcomes the limitation of the smaller key size of the Data Encryption Standard (DES) by utilizing a bigger and variable-length key that may take 149 ...