  The study of sending and receiving secret messages is called cryptography.
Generally, senders and receivers are unaware about the process of encryption
and decryption. Hence, encryption plays an important role in data communication
and data security. The meaning of encryption is not only to keep data
confidential from unwanted access but also ensuring the data integrity through
available way. As the capacity of breaking the security is increasing rapidly,
so, the process that hides information is one of the most concerned topics.
Advanced Encryption Standard is a popular, widely used and efficient encryption
algorithm, which has been used since it was invented. This paper focuses on the
AES key generation process and Substitution box. It modifies the conventional
key generation technique and builds the dynamic 3-Dimensional S-box of Advance
Encryption Standard. The proposed approach suggests 3-Dimensioanl Key
Generation Matrix and S-box. As per shown this novel technique increases the
amount of time it needs during encryption and decryption. The experimental
result shows that it also enhances the strength of AES algorithm. The proposed
approach illustrates the theoretical analysis and corresponding experimented
results.
