We have developed an FPGA board, the SASEBO-GII, to serve as a standard platform for evaluating the security of a cryptographic module with respect to side channel attacks. Side channel attacks extract secret information from a cryptographic module by analyzing power consumption and electromagnetic radiation. The SASEBO-GII board provides a uniform environment for researching side-channel attacks, making possible the development of international standards and metrics for security testing of cryptographic modules. The SASEBO-GII board supports dynamic reconfiguration, so that the board's functionality can be updated and its malfunctions can be repaired without stopping or rebooting the system. On-demand hardware implementation made it compact and low-power consuming. By advancing research on dynamic reconfiguration of hardware using the SASEBO-GII board, more secure, more reliable, and higher performance systems can be developed.