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(3) The reason for the rule change. DES encryption algorithm and RSA encryption algorithm (1) Understand the role of digital signature and CA certification. The firewall is a security mechanism that adds another layer of parameter network to the host filtering structure, so that there are two layers of separation between the internal network and the external network. The internal and external routers of the parameter network connect the internal and external networks respectively, as shown in Figure 5.4 . (6) The virus will check the network status every 20s at an interval of 20s . When the network is available, the virus will be locally 1) The first step: choose the operating system The main idea of ​​encryption and decryption is to integrate the encryption and decryption algorithm into the driver. This solution uses the traditional DES encryption and decryption algorithm as an example. user (7) HTTP options : HTTP options, here the default is fine. (1) The function and realization of each functional module of Fair firewall. The following first introduces several commonly used network commands and introduces the principle of port scanning. (3) The four leaders of the Ministry of Construction will issue the leadership card of the Ministry of Construction's "Urban Construction Card System". You need to input 4 bytes of key and 8 bytes of protection password to produce 4 leadership cards. (2) Understand the configuration and usage of "Glacier". 1.4.5 Information leakage or loss server (9) TGT (Ticket Granting Ticket) : the user proves his identity to TGS (Ticket Granting Server) 6. Where digital certificates can be used The maximum number of connections for each IP address, the number of connections allowed to pass the static address translation at the same time The SSL security protocol also has its shortcomings. The main ones are: it cannot automatically update the certificate; the certification authority is difficult to code; the browser password is arbitrary; it cannot automatically detect the certificate revocation table; the user's key information is stored in plain text on the server . In addition, although SSL provides security in the process of information transmission,ccna guided study group, the relevant credit card data should only be seen by the bank. However, these data are decrypted at the store side, and customer data is completely exposed to the merchant. Although the SSL security protocol has weaknesses, it is widely used on commercial websites in Europe and the United States due to its easy operation, low cost, and continuous improvement .

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