I. INTERNET SECURITY

Internet security should not be ignored. We have selected for you the best links to tutorials, background information and articles to help you stay informed:

• All about the SET (Secure Electronic Transaction) protocol
• Network Security Multi-part Tutorial
• UNIX System Security Issues
• ...A general overview of security issues that face the
  administrator of Linux systems. It covers general security philosophy and a number of specific examples of how to better secure your Linux system from intruders. Also included are pointers to security-related material and programs...
• Internet security and privacy: Special report features evaluation of products in 8 different security categories such as for home and business
• Network Security Tutorial ("If you have a network,
  whether it is a small home office network or a 5000 node LAN/WAN, securing it should be a top priority to you...")
• A FAQ intended to show and explain the steps and techniques behind hacking. While it serves both admin and hacker alike, the perspective is from the intruder
• A very large Javascript password protection FAQ!
• TCP/IP Tutorial and Technical Overview (Detailed!)
• Developments in denial-of-service tools to protect against Denial-of-service attacks
• How To Eliminate The Ten Most Critical Internet Security Threats - The Experts’ Consensus (Very Technical Advises for System Administrators.)
• IT Security Cookbook (Very detailed!)
• Frame Relay Tutorial Center (A large Gateway to Frame Relay Tutorials where visitors can learn all about frame relay and products related to networking protocols)
• NT's Top Security Problems - How worried should you be? (NT security problems & analysis)
• Windows NT Security (Detailed Overview)
• and more...

II. SSH - SECURITY SHELL

Need to know more about SSH? Here are the tutorials:

• A basic introduction to using SSH
• SSH (Secure Shell) FAQ (Very technical)
• The Secure Shell (SSH) Frequently Asked Questions (Very detailed)
• All About SSH - Part I/II: Replacing telnet/rlogin/rsh with SSH (Tutorial)
• A free SSH suite (Contains support for SSH1 and SSH2 protocols.)
• A free yet powerful SSH client
• OpenSSH Revisited: Simplify Remote Access with
  ssh-agent
• SSH Secure Shell for Windows Servers [$]
• Secure and Convenient? Key Authentication with
  OpenSSH (Article/Tutorial)
• and more...

III. CHECKING SECURITY - ONLINE TOOLS & SOFTWARE

Check your system with online & offline security tools. Why should you know less than your intruder?

• Computer Security: Hacking and Hacker (Various articles and links. You can also check your system on-line. A very interesting site)
• Shields-Up (Internet Security Analysis - Check the security of your PC online with this excellent on-line tool! There is also a tool to check your firewall.
• Vulnerability Assessment Service with link to a trial security check
• Free port scan security check (online check)
• Test you security (Several online & offline suites)
• Free tools for testing security (Download index page)
• and more...

IV. FIREWALLS

The best way to protect your PC or network system against intruders is to install a firewall system. Our firewall information and link guide below gives you a good overview and shows solutions to this important security aspect:

• Network Security, Filters and Firewalls (An Overview
• How to Build and Run a Firewall
• Firewall Gateways Overview (Tutorial)
• Thinking about firewalls - introduction
• Fight Fire with Firewalls (Firewall basics from MS,
• The Firewall Search Center (Firewall Products/Companies, Comparison charts!)
• Overview of Firewall Technologies
• The Firewall Wizards Archive (Very technical for professionals)
• The Educated Shopper's Guide to Firewalls (A good introduction for beginners)
• How NOT to build a firewall
• Firewall Tutorial Index (Detailed Tutorial)
• The Basics of Firewalls (Research paper about the basics of firewalls)
• Overview of Firewall Technologies (PDF, 9 pg)
• and more...

V. COOKIES

Are they dangerous or not? We think they aren't (at least not direct) but there are several sides of a coin. Read our link stories below to gain the insider knowledge:

• What is a cookie?
• Setting and reading cookies in PHP ("..Setting and reading cookies in PHP is a piece of--dare we say it?--cake. We don't want to get into all the propaganda about cookies, but they're important and useful. Sometimes they're the right tool for the job..." - Tutorial)
• Commentary on Cookies
• Too Many Cookies Are Bad for You
• Tutorial: Adding cookies to your site
• Like control cookies and get rid of them? You may look at our utility [$]
• Cookies in php (part of a tutorial)
• Creating Cookies with JavaScript
• Handling Cookies (Java)
• and more...

VI. PASSWORDS

Protect your visitors by strictly enforcing a proper designed privacy policy or privacy statement. They will thank you by increased visits and sales:

• Selecting Good Passwords
• Effective tools for managing passwords (links to three software utilities, freeware & shareware)
• Password protection without static HTML or a text file! The applet redirects to a file of the same name as the password. The password itself is not stored anywhere (Java Applet)
• and more...

VII. HTACCESS & CHMOD TUTORIALS

Ever wanted to know how to set-up the security on your UNIX system using .htaccess and chmod? Here are the tutorials you need to know:

• Changing access permissions: chmod
• CHMOD Chart (easy explained)
• Chmod - change file permissions (technically explained, manual)
• HTAccess (.htaccess and .htpasswd Authentication Tutorial)
• HTAccess Authentication Tutorial ("..This tutorial covers web-based user authentication using HTAccess. Web-based authentication denies web access to visitors who do not give a valid username and password. This feature allows webmasters to restrict access to certain directories. The usernames and encrypted passwords are kept in a webmaster-maintained file...")
• HTAccess (.htaccess and .htpasswd Authentication Tutorial)
• and more...

VIII. BIOMETRIC SECURITY SOLUTIONS

Biometrics solutions provide a way to secure your investments. While often expensive, they are also rather sophisticated. They exist in many areas but mostly designed for access control applications including the restricted access to your PC.

As the biometrics theme is too large for this security letter, we have recently created an own link-mail letter for it. The letter can be found at:

<http://www.link-mail.com/21200.html>
Primer to Biometrics - Tutorials, Technologies, Vendors &
Products (43 links)

• and more...

IX. ENCYCRYPTION

The highest level of security is offered by encycryption hardware and software. Here are some more security information about them.

• An extensive site about encycryption including many research papers (Very technical)
• and more...