Chapter 4. Solutions in this chapter:

  • Introduction to SSH
  • SSH Standards
  • SSH vs. Telnet/Rlogin
  • SSH Client/Server overview
  • Packet Capture Detection
  • Summary
  • Solutions Fast Track
  • Frequently Asked Questions

Introduction to SSH

The SSH (Secure SHell) protocol was designed as a secure alternative to Telnet and Rlogin. Telnet and Rlogin send all data in a clear text format over the network, allowing packet capture programs like Sniffer™ and Wireshark™ to read the interactive session and display the session in clear text. SSH uses encryption to protect the session from view if captured. Encryption is a process that converts clear text into cipher text through an algorithm (such as 3DES, AES, etc.). The client and the server have to agree on the algorithm ...

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