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paperback. Condición: New. Paperback Pages Number: 244 Language: Chinese. Internet and Email security to prevent practical techniques discussed in detail the common form of cyber attacks. in-depth analysis of the safety requirements of the Intemet and E.mail. encryption principle and encryption algorithms. comprehensive introduction to the Internet classification review and Safe Browsing method to very thoroughly explained the operation techniques and the use of techniques commonly used in firewalls and Internet filter.