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While most administrators use a security tool such as Nmap to perform a port scan to list available services on a remote system, Nmap can also be used to conduct a wide variety of functions that security and network administrators can find very helpful in discovering available hosts on the networks that they are responsible for. Discovering hosts can help system administrators ensure that they are monitoring all systems for availability while security administrators can ensure each system adheres to their company's security policy.

This article discusses host discovery features that are available...
Article Author
The Nmap Security Scanner written by Fyodor is a widely used security and network administration tool that can be used to perform a port scan of remote systems. A port scan of a system can let the Nmap user know which services are available on a system as well as if these services are accessible through a firewall.

This article discusses features that are available in Nmap 5.0 and higher. To download Nmap and access other related security resources, please visit www.insecure.org.

Conducting a Basic Nmap Scan from the Command Line
...
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The Luhn checksum is often used in analog to digital systems such as
many countries ID cards, credit cards and more.

The purpose is NOT to encrypt the number but prevent simple errors
such as digit misplacement and (usually) single digit errors.

Take the following non-existant Visa credit card number:
4580 4580 4580 4580

This number is correct using the Luhn checksum method, this ...
Article Author
Some malware (including virus's and other types of programs with bad intentions) as well as some hardening programs and utility's sometimes create files and directorys with illegal names.

Why "illegal" ?
Because some names such as LPT1, LPT2, LPTx, PRN, CON and more are reserved as
they have a unique meaning to the operating system.

Trying to rename/delete/modify a file or directory with such an illegal file name will return
Access Denied
...
 
 

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