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Diffusion of Cipher Blocks at Bit Level in Parallel AES to Improve Bit – Ratio Test thus Increasing Cryptanalysis Complexity

Author : Amin B. Mobhani and Shailendra K. Mishra

Pages : 1766-1769
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Information is an intelligible data through which knowledgeable and useful things can be conveyed or represented in a proper manner. With the advancement of technology, transmission of information over the network has become a trend. Hence information must be transmitted securely over the network. Data security was not a problem if a secured channel was provided for every single transmission. Hence it became a necessity to convert the information in an unintelligible form before transmitting it over an unsecure channel. Encryption is a technique through which original information can be converted into unintelligible form. As time evolved, various encryption algorithms were employed so that information can be securely transmitted over an unsecure channel. Hence even if an intruder gets access to the encrypted text he/she cannot gain any information from that text. But as the new algorithms were designed, all the algorithms were challenged and their cryptanalysis became possible. In the year 1998, Advanced Encryption Standards (AES) was proposed and later it was widely accepted as the most secure encryption algorithm that can be used for encrypting the information so that it can be transmitted securely over an unsecure channel. To make AES more faster a new scheme called Parallel AES, was employed which takes four blocks of 16bytes each at a time to generate four blocks of 16bytes of cipher text thus providing diffusion of blocks at byte level. By doing this parallel AES stood to be much faster than sequential AES. In this research we are further increasing the complexity of cryptanalysis by implementing parallel AES to provide diffusion of blocks at bit level. The proposed scheme will diffuse 32 blocks of data with the 8 blocks of key thus generating 32blocks of cipher text.

Keywords: Cryptography, Information Security, Encryption Algorithm, Parallel AES, Bit Level Diffusion, Transformation Function, Bit-Ratio Test

Article published in International Journal of Current  Engineering  and Technology, Vol.4,No.3 (June- 2014)



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