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Proposed FPGA based technique considers a message as a binary string on which ROBAST is applied. A block of n-bits is taken as an input stream, where n ranges from 8 to 256 -bit, then ROBAST is applied in each block to generate intermediate stream, any one intermediate stream is considered as a cipher text. The same operation is performed repeatedly on various block sizes. It is a kind of block cipher and symmetric in nature hence decoding is done in similar manner. This paper also presents andoi:10.14569/ijacsa.2011.020408 fatcat:isun4tf2qnbnro6blex77zepja