Abstract

Increasing need of data protection in computer networks led to the development of several cryptographic algorithms hence sending data securely over a transmission link is critically important in many applications. The Advanced Encryption Standard is a specification for the encryption of electronic data established by NIST. In the existing system two methods are using for high throughput encryption and decryption which are One Task One Processor method and Loop unrolled Nine times method. In order to eliminate the drawbacks of existing system such as security issue due to Differential Power Analysis we are proposing a high throughput AES with masked S box . Here instead of using a look up table S box, substituting values are generating during the execution which is composed of mainly two transformations. Firstly, we calculate the multiplicative inverse in GF(2^4) .And then we apply an affine transformation.Inorder to merge the encryption S Box with decryption SB ox by reusing the finite field inversion circuit .We aim to optimize the area for a masked S box AES which is achieved this by mapping its operations from GF(2^8) to GF(2^4) . Since the cryptographic strength of the AES depends strongly on the choice of S-box the proposed method will provide high security than the existing system

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