GnuPG allows encrypting and signing your data and communication, and features a versatile key-management system and access modules for all kinds of public key directories.
GnuPG支持数据和通信的加密和签名，且以一个多功能的密钥管理系统和各种公钥目录的访问模块为特色。
As the encryption algorithm and decryption algorithm are open to everyone, so the private key storage management becomes an insecure part in public key system.
在公钥密码系统中加密和解密算法是公开的，因此私钥存储管理成了公钥系统安全中薄弱的环节。
Through some improvement to the RSA public key system, a new method of multicast encryption is put forward and then corresponding key management model is given.
并通过对RSA公钥密码算法的改进，给出一种新的组播加密方法，进而给出相应的密钥管理方案。
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