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EXISTING SYSTEM

PROPOSED SYSTEM

EXISTING CONCEPT:

RAW IMPLEMENTATION:

        This TI of the S-box (details will be given in the following section) requires four input shares, therefore we initially share the plaintext in four shares. We share the key in two shares and XOR them with two of the plaintext shares before the S box operation. More details about the key scheduling will be given later in this section.

ADJUSTED IMPLEMENTATION:

          Each of the existing three shares is XORed with a random byte and the sum of these random bytes is taken as the fourth share. This also ensures uniformity of the S-box input. Together with the state, the number of shares for Mix Columns and Key XOR increases to three.

PROPOSED CONCEPT:

NIMBLE IMPLEMENTATION:

        Similar to the raw implementation, this one also uses two shares for the state and key arrays. The main difference is that the S-box needs three input shares instead of four. Hence the size of the register P0 is reduced to 8-bits (one share). As a result, we need only 16- bits of randomness to increase the number of shares from two to three before the S-box operation, i.e. each share is XORed with one byte of randomness and the XOR of the random bytes is taken as the third share.

EXISTING  ALGORITHM:

·         Raw implementation

·         Adjusted implementation

PROPOSED  ALGORITHM:

         Nimble implementation

ALGORITHM  DEFINITION:

      we need 44 fresh random bits per S-box operation including increasing the number of shares of the Sbox input.

      we use 24-bits of randomness to increase the number of shares from three to four one cycle before the S-box,

ALGORITHM  DEFINITION:

      This construction requires only 32-bits of extra randomness per S-box calculation, including increasing the number of shares for the S-box input.

EXISTING SYSTEM DRAWBACKS:

·         The longest critical path

·         The maximum area of occupancy

·         Low speed

ADVANTAGES:

         Area efficient

         High Throughput

         More Secure