Three Measures of Availability in Cybersecurity

In Learning Tree Course 468, Introduction to Cybersecurity, we talk about three core elements of cybersecurity: confidentiality, integrity, and availability. The latter probably gets the least attention. It gets limited attention in Course 450, Introduction to Networking, too. Since availability is an essential pillar of cybersecurity, we’ll look at three important availability metrics here: Uptime […]
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Mozilla To End ftp Support. What Are the Alternatives?

In March of this year, Mozilla followed in the steps of Google and announced the upcoming end to support for the ftp protocol in its browser. That is a very good thing! The ftp URI is the mechanism for browsers to use FTP (the File Transfer Protocol) to send and receive data from servers supporting […]
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Dovecot is Now My Favorite Unix/Linux IMAP Mail Download Server

As you may know, there are two kinds of email systems: Outlook, and everything else. The non-Outlook-based email world consists mainly of three kinds of software: MDAs, MUAs, and anti-spam/antivirus. Dovecot is the glue between your MDA and your MUA.[gview file=”https://blog.learningtree.com/wp-content/uploads/pdf/dovecot-email-flow.pdf”] MDAs are the mail delivery agents, such as SendMail, PostFix, OpenSMTPD, and more. An […]
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Your Wi-Fi Can Be Heard a Long Way Away

Many people are frustrated by their Wi-Fi networks. Among other things, there is interference, reflections, attenuation (signal loss) because of walls, long distances or whatever, and the hassle of managing all that. We have to remember one critical thing about Wi-Fi: it’s radio so it is heavily regulated. The power the devices and access points […]
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How To Use wget To Download Websites

A friend needed to move her website from one hosting provider to another. The problem was that she used a website builder on the first provider so she didn’t have the content on her computer; she recoiled at the thought of re-entering it. wget to the rescue! GNU Wget is a tool that can download […]
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