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RE: Port Knocking questions
From: "Yvan Boily" <yboily () seccuris com>
Date: Mon, 1 Mar 2004 14:47:33 -0600

Port knocking is a form of access control.  In short, port knocking is the
process of modifying access to a system based on a sequence of attempts to
connect to a network.  If you google for it you should find some good papers
on the subject.

Like any other security tool it can be used to improve security for either
legitimate uses, such as providing a form of authentication before granting
access to a server on a protected system, or for more nefarious purposes,
such as creating a backdoor that only opens when a sequence is played,
making such doors incredibly difficult to detect.


Yvan Boily
Information Security Analyst

-----Original Message-----
From: Richard Shinkle [mailto:rshinkle451 () hotmail com] 
Sent: Friday, February 27, 2004 10:58 PM
To: security-basics () securityfocus com
Subject: Port Knocking questions


I have a few questions about port knocking.  First of all, is it a hacker
tool or a security tool?  Does it require the hacker to be able to ping the

Rich S.

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