一套非常好用的软件加密卡接口，支持对称、非对称加密以及密钥的管理。适用于windows平台。-a very user-friendly encryption software interface cards support symmetric and asymmetric encryption and key management. Windows platform applicable to.

利用RSA对称算法实现文件加密，密钥512位，比较安全。但不是特别安全。因为推荐2048位的密钥目前是很安全的。-use RSA asymmetric encryption algorithm document, the key 512, relatively safe. But it is not particularly safe. Since 2048 recommended the key now is very safe.