Chapter 17. Securing Remote Logins with OpenSSH
IN THIS CHAPTER
OpenSSH is the open source version of SSH, or Secure Shell. Connectivity tools such as Telnet and FTP are well-known, but they send data in plain text format, which can be intercepted by someone using another system on the same network, including the Internet. On the other hand, all data transferred using OpenSSH tools is encrypted, making it inherently more secure. The OpenSSH suite of tools includes
ssh for securely logging in to a remote system and executing remote commands,
scp for encrypting files while transferring them to a remote system, and
sftp for secure FTP transfers.