Alternate approach of design of s-boxes and their evaluation
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Date
2019-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
Security of data is a major issue in performing any business or economic transactions. In order to provide effective security to important data communication, cryptography has a role to allow only the authorized person to access the data. There are many algorithms. Data Encryption Standard (DES) which is a symmetric block cipher algorithm with 64-bit blocks and a 56-bit key has been used for data encryption. Small key size makes it vulnerable to the Brute Force attack. At the very instance, it provides flexibility against the Differential Cryptanalysis and Linear Cryptanalysis. To enhance the security of DES, S-boxes are used to provide confusion (making relationship between key and cipher text more complex as possible) during the encryption process. In this thesis, alternate S-Boxes are formed using the XOR operation which is applied to the randomly selected values lies in the range 0-15. These S-Boxes are analyzed on the basis of Strict Avalanche Criterion (SAC) through the Avalanche Effect and Completeness Effect for which results are interpreted using the column graphs. Further, it is evaluated on an alternate of the function approximation process known as the Vandermonde Approach. It performs the comparison among functions of both the DES S-Boxes and alternate S-Boxes. The result shows that the proposed SBoxes satisfy the SAC criteria and provides better function approximation leads to the better data encryption.
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