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Nmap can adapt to network conditions including latency and congestion during a scan. Nmap started as a Linux utility [8] and was ported to other systems including Windows, macOS, and BSD. [9] It is most popular on Linux, followed by Windows. [10]
Gordon Lyon has lost control of the Nmap SourceForge page, with SourceForge taking over the project's page. Lyon stated "So far they seem to be providing just the official Nmap files (as long as you don't click on the fake download buttons) and we haven't caught them trojaning Nmap the way they did with GIMP. But we certainly don't trust them ...
Gordon Lyon (also known by his pseudonym Fyodor Vaskovich) [1] is an American network security expert, [2] creator of Nmap and author of books, websites, and technical papers about network security. He is a founding member of the Honeynet Project and was Vice President of Computer Professionals for Social Responsibility .
Banner grabbing is a technique used to gain information about a computer system on a network and the services running on its open ports. Administrators can use this to take inventory of the systems and services on their network.
hping is an open-source packet generator and analyzer for the TCP/IP protocol created by Salvatore Sanfilippo (also known as Antirez). It is one of the common tools used for security auditing and testing of firewalls and networks, and was used to exploit the idle scan scanning technique (also invented by the hping author), and now implemented in the Nmap Security Scanner.
ZMap is a free and open-source security scanner that was developed as a faster alternative to Nmap. ZMap was designed for information security research and can be used for both white hat and black hat purposes. The tool is able to discover vulnerabilities and their impact, and detect affected IoT devices.
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A covert channel is so called because it is hidden from the access control mechanisms of secure operating systems since it does not use the legitimate data transfer mechanisms of the computer system (typically, read and write), and therefore cannot be detected or controlled by the security mechanisms that underlie secure operating systems.