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Additional resources for Using SSH
General TCP port forwarding operates as described earlier for any TCP-based service. , X windows). 3] The third type, agent forwarding, permits SSH clients to access SSH public keys on remote machines. 2. A Cryptography Primer We’ve covered the basic properties of SSH. Now we focus on cryptography, introducing important terms and ideas regarding the technology in general. There are many good references on cryptographic theory and practice, and we make no attempt here to be comprehensive. ) We introduce encryption and decryption, plaintext and ciphertext, keys, secret-key and public-key cryptography, and hash functions, both in general and as they apply to SSH.
A more complex example is a replay attack. Imagine that Attila the Attacker is monitoring your SSH session and also simultaneously watching over your shoulder (either physically, or by monitoring your keystrokes at your terminal). In the course of your work, Attila sees you type the command rm -rf * within a small This is the Title of the Book, eMatter Edition Copyright © 2001 O’Reilly & Associates, Inc. All rights reserved. 1. Overview of Features 43 directory. He can’t read the encrypted SSH session data, of course, but he could correlate a burst of activity on that connection with your typing the command and capture the packets containing the encrypted version of your command.
Now we focus on cryptography, introducing important terms and ideas regarding the technology in general. There are many good references on cryptographic theory and practice, and we make no attempt here to be comprehensive. ) We introduce encryption and decryption, plaintext and ciphertext, keys, secret-key and public-key cryptography, and hash functions, both in general and as they apply to SSH. Encryption is the process of scrambling data so that it can’t be read by unauthorized parties. An encryption algorithm (or cipher) is a particular method of performing the scrambling; examples of currently popular encryption algorithms are RSA, RC4, DSA, and IDEA.