A Block Cipher Based Cryptosystem through Modified Forward Backward Overlapped Modulo Arithmetic Technique (MFBOMAT)
Journal Title: IOSR Journals (IOSR Journal of Computer Engineering) - Year 2013, Vol 13, Issue 1
Abstract
In this paper, a new Cryptosystem based on block cipher has been proposed where the encryption is done through Modified Forward Backward Overlapped Modulo Arithmetic Technique (MFBOMAT). The original message is considered as a stream of bits, which is then divided into a number of blocks, each containing n bits, where n is any one of 2, 4, 8, 16, 32, 64, 128, 256. The first and last blocks are then added where the modulus of addition is 2 n . The result replaces the last block (say N th block), first block remaining unchanged (Forward mode). In the next attempt the second and the N th block (the changed block) are added and the result replaces the second block(Backward mode).Again the second (the changed block) and the (N-1) th block are added and the result replaces the (N-1) th block (Forward mode).The modulo addition has been implemented in a very simple manner where the carry out of the MSB is discarded to get the result. The technique is applied in a cascaded manner by varying the block size from 2 to 256. The whole technique has been implemented by using a modulo subtraction technique for decryption.
Authors and Affiliations
Debajyoti Guha
Keywords
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