Abstract: AES algorithm was modularized and the operation of it was generalized. A unified framework was proposed for block cipher resembling AES algorithm. In this framework, not only AES encryption or decryption can be realized,but also the specific block cipher algorithm can be set through external parameters. I}he use of cryptographic algorithms is more flexible and security. FPGA realization for the unified framework was also given. The testing results show the scheme is feasible and has a higher speed.

Key words: AES, FPGA, Block cipher