Enhanced Advanced Encryption Standard with Randomised S Box

Networks and communications today is an inherent part of any military and defence force organisation. Internet of things (IoT) is also making inroads into various defence networks and applications. Such networks and applications have sensitive data riding on them which is vital national security. Hence, the requirement of protecting and securing this data. The Advanced Encryption Standard (AES), is a Federal Information Processing Standard (FIPS) for symmetric cryptography since 2001, and is the most secure symmetric in the public domain. However, the AES being a public algorithm and also known to be vulnerable to various crypt analytical attacks, cannot be used in its original form for military networks and applications. This paper does an extensive review of the various proposed modifications to the AES algorithm, and proposes an enhanced AES algorithm with a randomised S box, which provides better security than plain AES with negligible overheads and hence can be employed for military networks and IoT applications.