Next Previous Contents 6. This section contains miscellaneous information regarding hacking basics. A backdoor is simply a way back into a system that not only bypasses existing security to regain access, but may even defeat any additional security enhancements added onto a system.
Backdoors can range from the simple to the exotic.
Simple backdoors might include creating a new user account just for your intrusion needs, or taking over a little-used account. More complex backdoors may bypass regular access completely and involve trojans, such as a login program that gives you administrative access if you type in a special password. Backdoors can be chained together, which is the technique used by most hackers. This involves a combination of techniques. For example, one or more accounts that have basic user access may have had their passwords cracked, and one or more accounts may be created by the hacker.