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For example: the method of using random numbers only increases the difficulty of these analyses, but it seriously increases the time of encryption and decryption, and these analysis techniques can also decipher this method of using random numbers. 5. New virus The key value of windows auto update=msblast.exe in Version\Run item . Practice has shown that filtering router firewalls are the simplest security precautions. Dual-hosted host firewalls are in the middle. Host filtering firewalls and subnet filtering firewalls are ideal. Strap-type firewalls are the best, but generally in small and medium-sized enterprises. The network is not widely used. Using VLAN ( virtual local area network ) technology to change Ethernet communication into point-to-point communication can prevent most intrusions based on network monitoring. ! Enable both interfaces as 10Mb , half duplex: (1) Web server: IIS 6.0 , IP address is 192.168.20.124 , computer name is SZY . (1) Start Foxmail , execute the "Properties" command under the "Account" menu, and click the "Security" icon in the "Account Properties" dialog box,cisco ccna for free, as shown in Figure 8.7 . Dynamic address translation is used to translate a range of local addresses into a range of global addresses, or a global address. Translating a range of local addresses into a range of global addresses is called Network Address Translation (NAT) . For adopting 4.1.1 Principle of Digital Signature 4. Non-repudiation (3) Tampering: The receiver intentionally tampered with the received information. In REGEDIT4 must be followed by a blank line, and REGEDIT4 of T and 4 between must not have spaces. A variety of sources of computer viruses, some computer hobbyists staff or pure devilment and manufactured, some of them are software companies to protect their products from illegal copying and manufacture of retaliatory punishment, because for them to find It is more effective and more threatening to use viruses to deal with illegal replication than encryption, and this situation encourages the spread of viruses. There is also a case of deliberate sabotage, which is divided into two types: personal actions and government actions. Personal actions are mostly employees' retaliation against their employers , while government actions are organized strategies and tactics. ( It is said that during the Gulf War, a secret agency of the U.S. Department of Defense carried out a planned virus attack on Iraq’s communications system. Once paralyzed Iraq’s defense communications ) . In addition, some viruses are still "useful" programs designed for research or experiments . For some reason, they lose control and spread out of laboratories or research institutes, thus becoming computer viruses that endanger the Quartet.

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