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With the rapid development of the computer Internet, malicious attacks in network information systems have also evolved and changed. Due to the strong temptation of economic interests, in recent years, various malicious attacks have mainly focused on the fields of e-commerce and electronic finance. Attacker (3) When the virus runs, it will copy itself to %systemdir%\msblast.exe , and the user can manually delete the virus file (%systemdir% is a variable, which refers to the system directory in the operating system installation directory ) . (2) The network is full of useless data packets, and the source addresses are all forged. In the famous AT&T Bell Labs in the United States , three young people play a game boringly after work: they write programs that can eat other people's programs to fight each other. This is called "Core War" (Core the WAR) game, further computer viruses concept of "infectious" reflected. ② Execute "Start" → "Program" → "Accessories" → "Communication" → "Hyper Terminal" command. Electronic signatures based on PKI are called digital signatures. Some people call "electronic signatures" as "digital signatures", but this is actually a general term. Digital signature is only a specific form of electronic signature. Although electronic signatures have gained technological neutrality,cisco ccna sign up, they also bring inconvenience to use. The law has further stipulated electronic signatures, such as the aforementioned UNCTAD ’s “Model Law on Electronic Signatures” and the EU’s “Common Framework for Electronic Signatures”. The "Directives" stipulate "reliable electronic signatures" and "advanced electronic signatures", which actually stipulate the functions of digital signatures. This kind of regulation enables digital signatures to obtain better application security and operability. At present, the only electronic signature with practical significance is public key cryptography. Therefore, the project is still before the widespread use of domestic and foreign-based PKI digital signature technology. As a public key infrastructure, PKI can provide a variety of online security services, such as authentication, data confidentiality, data integrity and non-repudiation. These all use digital signature technology, which is also the focus of this chapter.

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