Charles Graeber has an excellent pieces(s) in the print and on-line versions of WiredThe gist of this is that Medeco cylinders – which are by all accounts harder to pick than standard lock cylinders – are, given the right technique, vulnerable to picking/bypass in under a minute. Since they’re used in sensitive installations – the [...]
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The same messages can be communicated by signalling the letter "K" in Morse code via signal lamp. (While a proper signal lamp may be ideal, a flashlight, probably best employing red LEDs, will certainly fit the bill).
In Morse, the letter "K" is represent as Dash - Dot -- Dash.
The ICS also has a subset, the Medical Signal Code, which uses three-character phrases to communicate brief medical messages.