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contains most about tcp/ip hijacking
symmetric-key systems are simpler and faster, but their main drawback is that the two parties must somehow exchange the key in a secure way. public-key encryption avoids this problem because the public key can be distributed in a non-secure way, and the private key is never transmitted. 【程序编程相关:FC4: Snort+mysql+Apa】
encryptionsystem in which the sender and receiver of a message share a single, common key that is used to encrypt and decrypt the message. contrast this with public key cryptology, which utilizes two keys - a public key to encrypt messages and a private key to decrypt them. 【推荐阅读:中国客运列车旅客乘车情况问卷（A卷）】
复习一下private address: 169.254.x.x,k 什么破题,出个169.253, 太狡诈了. 【扩展信息:Xcon 2005精彩议题】
symmetric-key cryptography is sometimes called secret-key cryptography. the most popular symmetric-key system is the data encryption standard des.
class a: 10.0.0.0 - 10.255.255.255class b: 172.16.0.0 - 172.31.255.255class c: 192.168.0.0 - 192.168.255.25
split tunneling:
the process of allowing a remote vpn user to access a public 网络, most commonly the internet, at the same time that the user is allowed to access resources on the vpn. this method of network access enables the user to access 远端 devices, such as a 网络打印机, at the same time as accessing the public network.
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