By David Basin
This e-book explores basic ideas for securing IT platforms and illustrates them with hands-on experiments which may be performed by way of the reader utilizing accompanying software program. The experiments spotlight key info safeguard difficulties that come up in glossy working structures, networks, and internet purposes. The authors clarify tips to determine and make the most such difficulties they usually exhibit various countermeasures and their implementation. The reader hence earnings an in depth realizing of ways vulnerabilities come up and sensible event tackling them.
After featuring the fundamentals of defense ideas, digital environments, and community companies, the authors clarify the middle defense rules of authentication and entry regulate, logging and log research, net software safety, certificate and public-key cryptography, and hazard administration. The booklet concludes with appendices at the layout of similar classes, record templates, and the fundamentals of Linux as wanted for the assignments.
The authors have effectively taught IT defense to scholars and pros utilizing the content material of this ebook and the laboratory surroundings it describes. The ebook can be utilized in undergraduate or graduate laboratory classes, complementing extra theoretically orientated classes, and it may even be used for self-study through IT pros who wish hands-on event in utilized info defense. The authors' assisting software program is freely on hand on-line and the textual content is supported all through with exercises.
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Additional info for Applied Information Security: A Hands-on Approach
It solves many of the security-related problems of rsh and Telnet. Since SSH encrypts all communication, it provides secure connections that are resistant against interception and it offers protection against message manipulation as well. Furthermore, SSH provides a secure alternative to rsh’s user authentication by using public key cryptography to authenticate users. In the following we will use OpenSSH, a free version of SSH on Linux systems. Stop the SSH service (sshd) running on bob and start it again in debug mode, listening on the standard port 22 to observe the individual steps taken during authentication.
4 You have used the port scanner Nmap to identify running network services on a server. Now suppose that you have placed your server behind a firewall, and have used Nmap to find potentially forgotten open ports. Nmap’s output shows many open UDP ports. What could be the problem? 5 Explain the differences between a stealth scan and an ordinary port scan. 6 Using the command option nmap -O [IP-Addr], Nmap can sometimes determine the target computer’s operating system. Explain the underlying principle.
The most prominent Linux firewall is netfilter/iptables. See, for example, the manual page for iptables. TCP wrapper: A TCP wrapper provides a simplified firewall functionality. Incoming TCP requests for a given service are not directly forwarded to the corresponding process, but are first inspected by the wrapper. Under Linux the most prominent TCP wrapper is tcpd, which works in combination with the inetd services. conf file the service associated with a TCP port is replaced with a link to tcpd.