本文介紹了公開密碼加密體制、單向散列函數、認證機構和公鑰管理等。并在此基礎上，詳細探討了明文不需要保密的一般數字簽名實現算法、明文需要保密的數字簽名實現算法；提出了發送方和接收方均不可抵賴的帶加密數字簽名實現算法。這些算法具有安全、快捷等特點，適合于不同應用場合的網絡數據通信。
關鍵詞：公鑰體制；CA 認證；數字簽名;應用研究
Abstract: Public key system, single direction Hash function, certificate authority organization and public key management are introduced. On this base, general digital signature which document does not need to be kept secrecy, and encrypting digital signature which document needs to be kept secrecy are discussed. Undeniable encrypting digital signature is presented. These signature technologies have the advantages of safety and speediness，they are suitable for internet data communication in different areas.
Key words: Public key system; Certificate authority; Digital signature；Application Research