基于usb　key的csp实现.在此之前要对usb key与csp等加密知识有一定的了解。

基于usb　key的csp实现.在此之前要对usb key与csp等加密知识有一定的了解。-Usb key based on the realization of the CSP. Prior to the usb key with the CSP, such as encryption have some understanding of knowledge.