International Journal of Computer Applications in Engineering Sciences (IJCAES)
This paper presents the architecture and modeling of modular multiplication for RSA public key algorithm. It supports multiple lengths like 128 bits, 256 bits, 512 bits of data. In this paper simple shift and add algorithm is used to implement the modular multiplication. It makes the processing time faster and used comparatively smaller amount of space in the FPGA due to its reusability. Each block is coded with Very High Speed Integrated Circuit Hardware Description Language. The VHDL code is synthesized and simulated using Xilinx-ISE 10.1.