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分析了群组用户对信息安全的特殊需求，提出了一种面向群组用户的密码体系。方案基于公开密钥算法，并使用多项式对密钥进行分割，可以实现用户组间的数字签名、验证以及加密、解密，而且不会泄露用户的私人密钥。给出了基于 RSA算法的具体实现，并分析了安全性。
This paper analyzes the special needs of group users for information security and proposes a password system for group users. The scheme is based on the public key algorithm and uses the polynomial to divide the key so as to realize the digital signature, verification, encryption and decryption among user groups without revealing the user’s private key. The concrete realization based on RSA algorithm is given and the security is analyzed.