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Advanced Linux Networking by Roderick W. Smith

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Chapter 26. Using a VPN

One problem frequently faced on the Internet at large is encryption. Many common protocols, such as Telnet and FTP, were not designed with data security in mind; they send data, often including usernames and passwords, in an unencrypted form. Such practices are sometimes tolerable on a local network, where you can control access to the network hardware, but they're very risky on the Internet at large, where your data may pass through a dozen or more routers between client and server.

WARNING

WARNING

Don't assume that data on your local network is safe. A cracker controlling a compromised computer or a disgruntled local user can wreak ...

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