Mata Hari, Call Your Office!

Margaretha Geertruida Zelle MacLeod, aka "Mata Hari," executed by the French in 1917 for allegedly spying for the Germans / Wikimedia

Moving at the speed of sludge, the CIA this week declared it has finally declassified its oldest still-secret documents it has: spy documents from World War I. One outlines the chemicals and techniques necessary for developing certain types of secret writing ink and a method for opening sealed letters without detection. Another memorandum dated June 14, 1918 – written in French – reveals the formula used for German secret ink.

“These documents remained classified for nearly a century until recent advancements in technology made it possible to release them,” CIA Director Leon E. Panetta said. “When historical information is no longer sensitive, we take seriously our responsibility to share it with the American people.”

Not everyone viewed this so grandly. “It is unknown what `recent advancements in technology,’ if any, might have occurred…to compel a complete reversal in CIA’s view on declassification of these records,” says Steven Aftergood of the Federation of American Scientists’ Project on Government Secrecy. The agency, he noted, fought a 1988 lawsuit seeking their release, and a federal court sided with the CIA.

Well, thank God for small favors: the released documents were not written in invisible ink:

– This one contains the secret German recipe for invisible ink.

More on the ink, zut alors!

Secret Writing, in English.

– How to open a sealed envelope, clandestinely.

– Potential hidden inks.

Invisible Photography and Writing, Sympathetic Ink, Etc.

If you can’t figure out why these somewhat crytic and sometimes confusing documents should have been kept classified for nearly a century, forget it — you’re plainly not cut out to be a spy.

Related Topics: mata hari, CIA, Intelligence, National Security
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  • http://forgottenlord.livejournal.com forgottenlord

    It’s probably the advancement of the ability to actually, using various technologies, to see inside the envelope without opening it, probably simultaneously removing the usefulness of these secret inks as, while they might be invisible to the naked eye, to an electronic eye they wouldn’t be invisible. This technology might not be exceedingly new, but the fact that it’s exploded so even the most backwards intelligence agencies in the world could easily pick up an iPhone that can do half of that makes it so that it doesn’t even work as an n-th backup encoding mechanism under any circumstance.
    .
    Yeah, intel doesn’t let anything that could possibly be useful in a million-bajillion-to-one probability scenario to be considered unimportant enough to release.

  • deconstructiva

    Thanks, Mark. I wonder if Mata Hari engraved messages into her toenails or wrote love letters in artichoke juice (does that make her missives word salad?).
    .
    Alas, the photo caption says she was executed in 1971, not 1917. Did the French make her rot in jail that long before getting around to the firing squad? Or maybe they wanted to speed it up before getting rid of the death penalty (1981)? I was surprised to find out they still used the guillotine until then. And we thought the US had a really long death row timeframe (except TX under W, of course).

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