Packet Storm - Information Security News, Files, Tools, Exploits, Advisories and Whitepapers http://packetstormsecurity.org/ en-us Mon, 28 May 2012 12:13:25 GMT 144400 http://packetstormsecurity.org/ http://www.google-analytics.com/__utm.gif?utmwv=1.3&utmn=1190973591&utmcs=ISO-8859-1&utmsr=31337x31337&utmsc=32-bit&utmul=en-us&utmje=0&utmfl=-&utmcn=1&utmdt=Files%u2248%20Packet%20Storm&utmhn=packetstormsecurity.org&utmr=-&utmp=%2Flinux%2Ffirewall%2Fiptables%2Fpkd-1.5.tgz%2F&utmac=UA-18885198-1&utmcc=__utma%3D32867617.1190973591.1338207205.1338207205.1338207205.1%3B%2B__utmz%3D32867617.1338207205.1.1.utmccn%3D(direct)%7Cutmcsr%3D(direct)%7Cutmcmd%3D(none) http://packetstormsecurity.org/files/83467/pkd-1.5.tgz http://packetstormsecurity.org/files/83467/pkd-1.5.tgz http://packetstormsecurity.org/files/83467/IPT_PKD-Iptables-Port-Knocking-Detection-1.5.html Sat, 05 Dec 2009 04:09:14 GMT ipt_pkd is an iptables extension implementing port knock detection. This project provides 3 parts: the kernel module ipt_pkd, the iptables user space module libipt_pkd.so, and a user space client knock program. For the knock packet, it uses a UDP packet sent to a random port that contains a SHA-256 of a timestamp, small header, random bytes, and a shared key. ipt_pkd checks the time window of the packet and does the SHA-256 to verify the packet. The shared key is never sent.