This scheme is based on public-key algorithm and the key is shared by polynomial. This scheme can realize digital signature, authentication, encrypt and decrypt. In the process the private key will not be revealed.

• 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。