VLSI implementation of text to image encryption algorithm based on private key encryption

摘要

In cryptographic applications, the data sent to a remote host are encrypted at the source machine using an encryption key and then the encrypted data are sent to the destination machine, where it is decrypted to get the original data. Thus the attacker will not have the encryption key which is required to get the original data and so a hacker can do nothing with any cryptographic system. Reprogrammable devices such as Field Programmable Gate Arrays (FPGAs) are used for hardware implementations of cryptographic algorithms. As FPGA devices progressed both in terms of resources and performance, the latest FPGAs provide solutions that are easily customizable for system connectivity, DSP, and data processing applications. In this paper, implementation of an efficient cryptographic algorithm is done in Xilinx SPARTEN 3E FPGA. Also the algorithm is analyzed by calculating the number of all possible key permutations.