On Mon, Mar 13, 2006 at 03:19:30AM -0500, Neal Murphy wrote:

[...]

> My idea is akin to a monastery that has no visible way in or out. If someone 
> wants in, he has to know where to knock, using the Super Secret Squirrel 
> coded knock. Then he has to wait a bit before he tries to pass his 
> credentials and hand through the wall. If he still passes muster (ID is OK 
> and his fingerprints match), he is then allowed to pass through the wall. If 
> he doesn't know the coded knock to begin with, he'll pass right by the 
> monastery, never seeing it.

[...]

This is basically port knocking:
http://en.wikipedia.org/wiki/Port_knocking



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