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ICETTR-2013
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Paper Title : Multi Way Feedback Encryption Standard (MWFES): Ver-I
Author Name : Purnendu Mukherjee, Prabal Banerjee, Asoke Nath
Abstract : In the present paper the authors have introduced a new symmetric key cryptographic method which is based on introduction of two way simultaneous feedback methods. Nath et al [14] already introduced both bit level and byte level feedback method and they have shown that the results were quite satisfactory. In the present study the authors tried to apply both forward feedback and backward feedback. The initial feedback is random and that will be determined by user entered key. The process starts from Left hand side of the plain text. The forward feedback (FF) and the key value is generated from user entered key string. The ASCII value of plain text is added with key and forward feedback and backward feedback (BF) to obtain intermediate cipher text. The intermediate cipher text is taken modulo operation with 256 to get cipher text. This cipher text is taken as feedback for the next column. In the second round we calculate the cipher text from the RHS. Here we use backward feedback (BF) from user entered text string. The ASCII code of plain text (last byte), key, BF and FF (initially 0) is added to obtain intermediate cipher text. It is then taken modulo with 256 to get cipher text. In the 3rd round we again do the same process with FF from 2nd byte from the beginning. The entire operation is continued till all feedback (both FF and BF) becomes non zero or modified. The encryption operation we perform n-number of times on the entire file. The decryption process is just the reverse process of encryption. The present feedback method is totally a new method and this can used for encryption of SMS, password in sensor networks. The results shows the present method is free from Differential attack, known plain text attack or any kind of brute force attack.
Keywords : Backward feedback, Forward feedback, Cipher Text, Plain Text, Two Way feedback, Multi way feedback, MWFES.
Cite this article : Purnendu Mukherjee, Prabal Banerjee, Asoke Nath " Multi Way Feedback Encryption Standard (MWFES): Ver-I " ,ICETTR-2013 ,Page No : 169-175.