This paper is researching the public-key cryptosystem based on two private keys, it's different from the generic PKC which USES only one private key.
该文研究双秘钥公开钥密码体制，它不同于一般的只有一个秘密密钥的公开钥密钥体制，而是使用两个秘密密钥。
Modern cryptosystem is divided into the public key system and the private key system.
现代密码体制分为公钥体制和私钥体制两大类。
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