Abstract
A non-Feistel block cipher cryptosystem viz. recursive substitutions of bits on prime–nonprime detection of sub-stream (RSBPNDS) is proposed and its FPGA implementation is reported in this paper. RSBPNDS operates by dividing the plaintext into number of blocks with fixed block cipher. A generating function is applied on source block and a target block is received. Combining the entire target block, the cipher text is generated. Block sizes of n-bits, total prime numbers and nonprime numbers are calculated in the range 0 to (2n − 1). These prime-numbers and nonprime numbers are encoded with minimum number of bits, suppose the value of the block is 12 then there are six primes and six nonprimes, so number of minimum bits required to encode is three. Select each source block and calculate its value then map to prime number set and nonprime number set. The superiority of the proposed algorithm, in comparison to RSA, is validated by the results of non-homogeneity and avalanche tests.
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Chakraborty, R., Mandal, J.K. An FPGA based non-feistel block cipher through recursive substitutions of bits on prime-nonprime detection of sub-stream (RSBPNDS). Microsyst Technol 25, 1679–1687 (2019). https://doi.org/10.1007/s00542-017-3662-8
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DOI: https://doi.org/10.1007/s00542-017-3662-8