PIN

Turning a cold war spy secret into a cheap anti-theft device

Posted 1 year ago by Paul Michael

Filed Under: Life Hacks

shhh

In the days of old, when spies passed messages to each other, they used many hidden messages. One of these methods was to hide the information in a dot of plastic or microfilm about the size of a pin head, and then end a sentence with it.

To the spy in the know, they could scan the page for the dot, pick up the tiny information and magnify it. Since the emergence of more sophisticated technology these methods had all but vanished. But now they've found a new use...marking your valuables.

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