Unfortunately, security hygiene is easier said than done. Despitewidespread recognition that (a) patching is effective and (b) attackersregularly exploit unpatched software, many organizations cannot or donot adequately patch. There are myriad reasons why, not the least ofwhich are that it is resource-intensive and that the act of patching isperceived to reduce system and service availability. However, delayingpatch deployment gives attackers a larger window of opportunity to takeadvantage of the exposure. Many organizations struggle to inventorytheir assets, prioritize patches, have defined and consistent processesand procedures for deployment, and adhere to policies and metrics forhow quickly patches are applied in different situations. Also, deployingenterprise patch management tools that operate with privileged accesswithin an enterprise can itself create additional security risks for anorganization if the tools are not secured properly.
Petru Rares Sincraian added several self-tests to FFmpeg and successfully went through the in-some-cases tedious process of fine tuning tests parameters to avoid known and hard to avoid problems, like checksum mismatches due to rounding errors on the myriad of platforms we support. His work has improved the code coverage of our self tests considerably.
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So, with all of these fantastic resources, why, you ask, am I writing these notes? In short, my students need to do a very specific subset of GIS tasks; these tasks are explained here. Hopefully the result is more efficient then sending many students separately to the myriad of QGIS websites.
Coordinate systems are simply reference frames for describing position. All geographic data must be placed in a coordinate system. Over the years, cartographers have developed numerous systems so now whenever we collect geographic data there are a myriad of choices when it comes to selecting a coordinate system. A full description can be found on the ESRI website, so here we will stick to the basics.
When logging in to a laptop, tablet, or other personal device, a username,password, or pattern are normally required to prevent unauthorized access. Inthese situations, the likelihood of somebody else intercepting your password islow, since logging your keystrokes requires a malicious exploit or physicalaccess. For systems like login12.myriad.ucl.ac.uk running an SSH server, anybodyon the network can log in, or try to. Since usernames are often public or easyto guess, your password is often the weakest link in the security chain. Manyclusters therefore forbid password-based login, requiring instead that yougenerate and configure a public-private key pair with a much stronger password.Even if your cluster does not require it, the next section will guide youthrough the use of SSH keys and an SSH agent to both strengthen your securityand make it more convenient to log in to remote systems.
There are hundreds--if not thousands--of techniques used to compromise both Windows and Unix-based systems. Malicious code and new exploit scripts are released on a daily basis, and each evolution becomes more and more sophisticated. Keeping up with the myriad of systems used by hackers in the wild is a formidable task, and scrambling to patch each potential vulnerability or address each new attack one-by-one is a bit like emptying the Atlantic with paper cup.If you're a network administrator, the pressure is on you to defend your systems from attack. But short of devoting your life to becoming a security expert, what can you do to ensure the safety of your mission critical systems? Where do you start?Using the steps laid out by professional security analysts and consultants to identify and assess risks, Network Security Assessment offers an efficient testing model that an administrator can adopt, refine, and reuse to create proactive defensive strategies to protect their systems from the threats that are out there, as well as those still being developed.This thorough and insightful guide covers offensive technologies by grouping and analyzing them at a higher level--from both an offensive and defensive standpoint--helping administrators design and deploy networks that are immune to offensive exploits, tools, and scripts. Network administrators who need to develop and implement a security assessment program will find everything they're looking for--a proven, expert-tested methodology on which to base their own comprehensive program--in this time-saving new book.
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