barcode reader java app download Part XI Ensuring Availability in Software

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Part XI Ensuring Availability
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The need for backup is common knowledge in today s fast paced world of informa- Ensuring Availability: tion technology Everybody has such a good understanding of backup that they for- Backup get to think about the real security issues Data protection and recovery issues are Systems complex and change from organization to organization Consequently, strategic thought about backup is often brushed over or taken for granted Don t put backup on the backburner when developing a security strategy give it the time and thought it deserves
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No matter how good your defenses, eventually a hacker will break through How will you know when this happens How will you catch the villain red-handed Intrusion detection technologies can help spot hackers during and after the fact Some of the tools can even identify places a hacker might attack before anything bad happens
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Properly deploying an intrusion detection system (IDS) is a massive undertaking that can only succeed if the organization has a compatible security philosophy and policies Regardless of the marketing, intrusion detection systems are tools for experienced network administrators not solutions that automatically solve problems on their own Some hackers are people, but most are actually computer programs Most intrusion detection systems are designed to catch people hackers, but end up being optimized to catch program hackers As used in practice, intrusion detection systems are glorified virus scanners (and we all know how effective those are)
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Detecting intrusions can only be accomplished with persistence and consistency The technologies covered here can help to verify the integrity of systems and data and detect if an intrusion has taken place 36, File Integrity, looks at tools can detect unauthorized modifications to critical system files and data 37, Virus and Trojans, covers malicious applications intended to give third parties some form of control over remote computer systems 38, Network Scanners, describes programs that examine critical network systems services for configuration errors and vulnerabilities 39, Network Sniffers, captures network traffic for the purpose of analysis and intrusion detection 40, Logging and Analysis, explores gathering and analyzing diagnostic status information from network devices and software
Copyright 2004 by J a s on Alba ne s e a nd We s S onne nre ich Click He re for Te rms of Us e
378 Network Security Illustrated
Introduction to Detecting Intrusions
An organization s security philosophy will dictate its stance against hackers and cyber crime If the philosophy dictates aggressive defense against malicious users, an intrusion detection system (IDS) will be a necessary tool Properly and effectively using an intrusion detection system can be costly and time consuming It often requires bringing on specialized staff or consultants The right staff will have the expertise to set the traps, hide in the trees, and snare the enemy when he or she walks over the net An intrusion detection system is made up of several parts Each of the parts needs to integrate seamlessly into the physical network on which it resides In addition, the design philosophy of the system as a whole needs to match the security philosophy of the organization
Intrusion Detection Is an Art and a Science
Certain prerequisites are necessary to make an intrusion detection system worthwhile, including the following: Network administrators with intrusion detection experience Network administrators with the spare time to monitor a network A security philosophy that includes the willingness to integrate business processes with logging technologies A network infrastructure that has been well designed and hardened Without these elements, the intrusion detection system will be an expensive system that won t produce results IDSs are powerful, but complicated They can be used to catch hackers, but they need to be wielded by an experienced network administrator However, when they are purchased by an organization that mistakenly thinks the system will create results automatically, they fail miserably Despite the way vendors often market intrusion detection systems, they are not automated solutions Virus scanners are an example of an automated solution that is used to detect, prevent, and delete viruses Virus scanners are able to accomplish this with some efficiency because they are programmed to chase other programs All of the movements that viruses may make are predetermined patterns The virus scanner is constantly updated to detect and delete the latest viruses Without the updates, it would be helpless against the newest viruses whose actions cannot be predicted A real hacker may use some programs as tools to help get at what he or she wants, but ultimately the high-level hacking will be performed manually This is why catching a hacker is an art as well as a science Intrusion detection tools can be used to catch an intruder in action if they re focused properly on the right things Knowing where the intruder might be at a given time (how to focus) takes expertise
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