Implementation of Non-Linear Feedback Stream Cipher System through Hybrid block Cipher Mode to Enhance the Resistivity and Computation Speed of AES

In a modern computing world, transmission of the confidential information over public network is very challenge. Various solutions have been proposed to provide the confidentiality, authenticity against the unauthorized access the information's. One of the secure solutions considered in this work under symmetric block cipher technique is Advanced Encryption Standard (AES). To enhance the efficiency of the AES, two non-linear feedback shift operations are enabled. The first non-linearity is achieved through Cipher Feedback mode (CFB), whereas the second non-linearity is through Output Feedback mode (OFB). The non-linearity and value-based rotation in each round would help in increasing the resistivity against the attacks. Whereas the reduction of one round of AES while processing every block of data would help in reducing the overall time required to process the information's. The proposed implementation has tested to verify the possible improvement in the efficiency, the same is discussed in result and discussion.