Now the csp modules that we can free avail all come from the software csp shipped with the windows system . these software csps are portable in that they can be carried as an executable file , but they inevitably have some limitations : the software csps have the less tamper - resistant and would be inconvenient in the fields of the interactive logon , e - mail signing , e - mail decryption and remote access authentication ; ' they have the lower level degree of security 但鉴于我们现在可获得的一系列的csp模块,均来自windows系统自带的软件csp ,软件csp可以以可执行性文件的形式存在、具有易携带性的优点,但是它在防篡改、远程登陆、用户的身份认证等领域有其不可克服的缺陷,安全等级比较低。