full-disclosure - Interesting idea for a covert channel or I justdidn't research enough?

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Date: Sat Oct  8 14:27:59 2005
From: Thierry at sniff-em.com (Thierry Zoller)
Subject: Interesting idea for a covert channel or I
	justdidn't research enough?

Dear Aditya Deshmukh,

AD> Aren't these all different versions of portknocking ? All of 
AD> them work untill someone outside can figure out the pattern of 
AD> events - at most I would call this security by obscurity -
Leveraged to real portknocking, i.e "encrypted payloads" (time based)
in different SYN, FYN, etc packets to different ports, you can't
easily get the pattern. Thus it leverages the "protection" over a
level that can be seen as security though obscurity. That said
you competely ignore that the Port 22 if open is not a security hole
itself. By hiding it you protect yourself from "possible" threads.

AD> Trivial to detect but good enough for some low security
AD> requirements
Proof it.

-- 
Thierry Zoller
mailto:Thierry@...ff-em.com