Cryptographic technology is an important way to ensure information security and is the kernel of information safety Among all kinds of cryptographic algorithms the block cipher is of some virtues-the fast speed of encryption and decryption the easy standardization convenient implement by software and hardware and so on So the block cipher is the core parts of the data encryption digital signature authentication and key management in the information security. Therefore it is widely used in the security area of the computer communication and in the security area of the information system. Rijndael is a respective one among block algorithms This paper analyses its performance in detail firstly then given the encryption and dencryption of the algorithm Because the hardware implementation is faster than software and can ensure the security of system in physics the projects of hardware implementation is presented and analyses the capabilities for FPGA and PLD and DSP and SID.Hardware Implementation ___________________________________ 978-1-61284-109-0/11/$26.00 ©2011 IEEE