Rotors of M-209 cipher machine.

Computer System and Network Security


Cybersecurity becomes more important every year, as we rely more and more on the world-wide Internet in government, business, and our private lives.

Everyone needs to know how to be safe enough in their personal email and web browsing. Preventing security vulnerabilities during custom software development has become a high priority. Learning about cybersecurity is a necessity for software developers and computer users alike. Start with my introductory page if you're new to cybersecurity.

The rest of these pages provide background for the courses I write and teach. They list the references and URLs for various tools, studies, news reports, and other things that come up in courses. I use these pages myself, so I don't have to try to memorize URLs and other reference details!

Here's that starting point:

Cybersecurity Basics
How to stay safe online

Few persons can be made to believe that it is not quite an easy thing to invent a method of secret writing which shall baffle investigation. Yet it may be roundly asserted that human ingenuity cannot concoct a cipher which human ingenuity cannot resolve.
— Edgar Allan Poe, in "A Few Words On Secret Writing", Graham's Magazine, July 1841

Internet threat warnings

I find these to be helpful sources of information on current events and trends:

Krebs On Security SecureList US-CERT Current Activity Flashpoint Intelligence Corner

DShield live banner.

Internet security "global dashboards"

The Internet Traffic Report monitors the flow of data around the world. It then displays a value between zero and 100. Higher values indicate faster and more reliable connections.

Some of these are useful, some have a relatively high level of hype, but you might find some of these useful:

Oracle Internet Intelligence Kaspersky DShield Internet Traffic Report SANS Internet Storm Center Live Digital Attack Map Internet Security Dashboard Security Wizardry Computer Network
Defence Situational Awareness

Where to go from here

Make sure you understand your systems well, and set them up properly! As Hippocrates said, "Primum non nocere", or "First, do no harm."

Be aware that your browser always gives away some information about you, unless you are using Tor and using it very carefully. Your browser just provided this information:

REMOTE ADDR3.89.87.12
HTTP IF MODIFIED SINCETue, 22 Sep 2020 17:10:53 GMT
HTTP ACCEPTtext/html, application/xhtml+xml, application/xml; q=0.9, */*; q=0.8