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  2. Port scanner - Wikipedia

    en.wikipedia.org/wiki/Port_scanner

    Most UDP port scanners use this scanning method, and use the absence of a response to infer that a port is open. However, if a port is blocked by a firewall, this method will falsely report that the port is open. If the port unreachable message is blocked, all ports will appear open. This method is also affected by ICMP rate limiting. [4]

  3. Port knocking - Wikipedia

    en.wikipedia.org/wiki/Port_knocking

    Port knocking cannot be used as the sole authentication mechanism for a server. From a security perspective, simple port knocking relies on security through obscurity; unintended publication of the knock sequence infers compromise of all devices supporting the sequence. Furthermore, unencrypted port knocking is vulnerable to packet sniffing.

  4. List of TCP and UDP port numbers - Wikipedia

    en.wikipedia.org/wiki/List_of_TCP_and_UDP_port...

    The port numbers in the range from 0 to 1023 (0 to 2 10 − 1) are the well-known ports or system ports. [3] They are used by system processes that provide widely used types of network services. On Unix-like operating systems, a process must execute with superuser privileges to be able to bind a network socket to an IP address using one of the ...

  5. ShieldsUP - Wikipedia

    en.wikipedia.org/wiki/Shieldsup

    ShieldsUP is an online port scanning service created by Steve Gibson of Gibson Research Corporation.The purpose of the utility is to alert the users of any ports that have been opened through their firewalls or through their NAT routers, which can be used by malicious users to take advantage of security vulnerabilities.

  6. A complete guide to internet security - AOL

    www.aol.com/lifestyle/a-complete-guide-to...

    Internet security refers to the measures and protocols implemented to protect online data and transactions from cyber threats, unauthorized access, and other forms of online exploitation.

  7. Honeypot (computing) - Wikipedia

    en.wikipedia.org/wiki/Honeypot_(computing)

    The honeypot catches the relay test email message, returns the test email message, and subsequently blocks all other email messages from that spammer. Spammers continue to use the antispam honeypot for spamming, but the spam is never delivered. Meanwhile, the honeypot operator can notify spammers' ISPs and have their Internet accounts canceled.

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