Peter Loshin

Learn all about Linux, including what goes into a Linux distribution, how Linux is used, how it works, the pros and cons of using Linux and its history.

The Open Web Application Security Project, or OWASP, identifies and ranks top web app security risks -- but that's not all. Discover what else OWASP does.

A good help desk can mean the difference between a successful product and an unsuccessful one. Find out what makes a good help desk and how it works.

Learn about the different types of SSH tunnels, and find out how both security professionals and hackers use them to circumvent firewalls.

SSH tunneling enables crossing protected network boundaries and firewalls. Learn how to use three types of SSH tunnels to protect network communications.

What’s the difference between SSH1 and SSH2? Learn how SSH protocol versions 1, 2 and 1.99 differ, and discover why they matter to security.

Learn how SPF, DKIM and DMARC -- the top internet email authentication protocols -- work together to fight spam, phishing and email spoofing.

Find out how to create an SPF record to prevent email forgery and cut down on spam and phishing by restricting email deliveries to authenticated servers.

Mandatory password expiration policies are ineffective. Learn why it’s time to reexamine password policies and how to best protect passwords today.

Email was designed without security considerations. Email security protocols, including SMPTS, SPF and S/MIME, add mechanisms to keep messaging safe from threats.