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LPIC-1/CompTIA Linux+ Certification All-in-One Exam Guide (Exams LPIC-1/LX0-101 & LX0-102) by Robb Tracy

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Encrypting Remote Access with OpenSSH

In the early days of UNIX/Linux, we used a variety of tools to establish network connections between systems. You could access the shell prompt of a remote system using Telnet, rlogin, or rshell. You could copy files back and forth between systems using rcp and FTP. However, these utilities had one glaring weakness. Network services such as Telnet, rlogin, rcp, rshell, and FTP transmit data as clear text. Anyone running a sniffer could easily capture usernames and passwords along with the contents of the transmissions.

For example, suppose I remotely accessed my Linux system via Telnet. After authenticating to the remote system, I decided that I needed to switch to root using the su command to complete several ...

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