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TUCoPS :: Network Appliances :: napl5170.htm

Routers or modem front panel LEDs blinking reveals actual data stream



7th Mar 2002 [SBWID-5170]
COMMAND

	Routers or modem front panel LEDs blinking reveals actual data stream

SYSTEMS AFFECTED

	??

PROBLEM

	From         Joe         Loughry          [joe.loughry@applied-math.org]
	[http://applied-math.org]  reports :
	

	LED status indicators on data  communication  equipment,  under  certain
	conditions, are shown to  carry  a  modulated  optical  signal  that  is
	significantly  correlated  with  information  being  processed  by   the
	device.
	

	--snipp--
	

	Experiments show that it is possible to intercept data  under  realistic
	conditions at a considerable distance.
	

	Full white paper with explanations and code snippet available from :
	

	http://applied-math.org

	

SOLUTION

	Put black tape over LED\'s ? :-)


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