Defense in Depth approach on AES Cryptographic Decryption core to Enhance Reliability

Security is need of the hour in today's world since the cyber physical systems are prone to malicious attacks. Advanced Encryption Standard is a cryptographic algorithm which is utilized extensively but is sensitive to dangerous attacks due to advances in technology. This paper administers Defense in Depth approach at system level on AES cryptographic core using an effective logic locking technique. AES lock block is inserted judiciously in subprocess of AES decryption algorithm. This approach achieves output corruption of 70% when incorrect password is provided at input due to which the probability of guessing the information and reverse engineering the architecture is reduced to greater extent. AES Lock block is highly efficient to secure the AES cryptographic decryption core. This work successfully shields AES cryptographic decryption core using Defense in Depth approach.