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As befits its detail- and variation-rich subject, this book comprises many specialised sections, each dealing with some specific aspect of use or configuration (setting up access control at the account level, for example, or generating keys for a particular SSH server). The writing is both informative and fun to read; the authors switch back and forth between text and entry-and-response listings from SSH machines. They often run through a half-dozen or more variants on the same command in a few pages, providing the reader with lots of practical information. The discussion of how SSH fits into a Kerberos Public Key Infrastructure (PKI) is great, as is the advice on defeating particular kinds of attacks. --David Wall
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The chapters on port/X11 forwarding are kept towards the end of the book so as not to frighten casual users, but the concepts are well explained with good diagrams although without a practical understanding of TCP/IP much of the content will go over peoples heads.
Misses out on one star for not showing enough humour to lighten what can at times be a dry topic (think Camel book!), and for not having details on Putty (a great,little,free Windows SSH implentation) in its Appendix.
SSH is a very useful collection of tools, providing secure replacements for programs such as telnet, rlogin, rsh, rcp, ftp, xon and rxterm. Any administrator concerned about passwords and other sensitive information being stolen by packet sniffers needs to be familiar with it.
Once set up SSH is generally easier to use than the less secure equivalents, but before you get to this happy state there are a number of choices to be made and hurdles to be jumped. This book is aimed primarily at the Unix system administrator or advanced Unix user and provides a huge amount of useful information.
The book starts with an introduction to the concepts of SSH, then moves on to the meat: detailed information about SSH for Unix users and administrators. Finally it discusses some implementations for Windows and Mackintosh users.
There are currently 3 main implementations of SSH for Unix: SSH1, SSH2 and the new but rapidly developing OpenSSH. They have much in common and the authors have elected to describe all three, pointing out differences as they go along. This is an ambitious approach, and inevitably adds some clutter to the text, but the authors have risen to the challenge and written an extremely clear and helpful book. They cover server administration, client configuration, and the clever port forwarding features which allow you to tunnel other protocols such as X11 and IMAP across an insecure network.
I would recommend this book to people who simply want to get SSH working as quickly as possible as well as those with an interest in cryptography.
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