| With the development of Internet and computer network technology, human being is coming into an era of communication with network, and traditional trade is turning into Electronic Commerce. Now, Electronic Commerce has been a potent mode of expanding trade in all walks of life, and its prospect is becoming more and more attracting. However, the open and anonymous characters of net make the security problems become more and more evident in electronic trade. Such as the information is betrayed or juggled during transmitting in Internet, as well as the cheated and denied problems.In order to ensure that the security of the electronic trade based on Internet is the same safe as the traditional trade has, we must establish a secure and convenient application environment in Electronic Commerce to assure the security of information in all business affairs. Since the technology of encrypting data is the foundation of Electronic Commerce's security, so we can say, Electronic Commerce's security does not exist without technology of encrypting data.PKI (Public Key Infrastructure) is a key fundamental technology to achieve Electronic Commence security, whose theory is based on Cryptography principle. PKI is a very safe encryption/ signature system by using the encryption technology, such as digital certificate, digital signature, etc. It is the most feasible and effective mode to solve the security problems during the development of Electronic Commerce. PKI solves the security problems on the identity authentication, the integrality of information and non-repudiation in network, and avoids the venture from anonymity information, and eliminates the risk from the opening network, and insures that the electronic transaction is effectual and safe, and promotes the development of Electronic Commerce greatly.This paper mainly studies the arithmetic of encryption and decryption in the security of Electronic Commerce, and solves the secure problems during the electronic transaction.Firstly, the developing background and correlation elements knowledge of Electronic Commerce are briefly introduced, and the developing status ofElectronic Commerce and some problems that face us are also simply analyzed, especially on the secure problem in Electronic Commerce.Next, the encrypt technology for the security of Electronic Commerce is discussed emphatically, which includes modern encryption theory (Secret Key Encryption, Public Key Encryption), some current arithmetic (DES> 3DES^ RSA^ DSA), integrality ( MD5 and SHA arithmetic in message digest and hash function) and the integrative application in encrypt/decrypt technology (digital signature, digital envelope),etc.Further, the elementary frame of PKI (Certificate Authentication % Registration Authentication n digital Certificate) and the function of every components are described, which includes the format of digital certificate, the issue of digital certificate, revocation of digital certificate, the inquiry of digital certificate and the management of secret keys.Lastly, according to modern encryption theory, the code of encryption and decryption is achieved, and the digital signature, digital envelope, identify authentication and other function are achieved by using the technology of digital certificate and public key encryption. |
