Science & Technology

X-rays defeat Letter Locking: The Secret of Ancient Folded Paper

A New papers in nature He says there is an algorithm that can read tightly folded characters without having to physically open them.

The challenge here is to reconstruct the complex creases, tacks and slits of unopened letters closed with “letter lock”. This is the method systematized in this paper, which has supported global communications security for centuries before modern envelopes.

These tight creases from a letter 300 years ago make a bold claim that they should be considered a historic link to modern cryptography.

Source: Nature, an example of a letter lock from the Brienne collection.
From: Unlocking history with automated virtual deployment of sealed documents imaged by X-ray microtomography

Letterlock has been a routine activity for centuries across cultures, borders and social classes, and is a secret system as a missing link between ancient world physics and communication security technology and modern digital encryption. Plays an integral role in the history of.

I have to say I disagree with this “no link” comment. Unless you extend the definition to include deployment, there doesn’t seem to be a decryption key to unlock the encryption, so it doesn’t seem to be in it.

A more obvious link from these letter lock examples to the latest method is … the latest letter lock.

Letter Lock: Aerogram, United States Postal Service (1995) From Letter lock on Vimeo..

Envelopes were a secret innovation of the 1800s, and I think it’s important to say that they provided Heme’s envelopes. Aerograms are basically the same as attacking one or the other, but are superficially less secure than putting them in an envelope — unlocking, deploying, and reading.

Therefore, I say that “lock” creases on envelopeless paper do not link directly to the latest encryption. That is, encryption has been present in letters for centuries (as I have done). Written here Before), apart from how the letters were folded.

For example, this is a German message intercepted by a British operator in Basra in 1918 after the liberation of Iraq.

The bottom note says, “Two letters missed the machine gun jam.” I think this is comparable to the “wormhole” in the development of rock letters. However, unlike the lock letter, which can be read once expanded, this text does not yet have a key.

Another example is an old slide I created to show what the keys of the 16th century looked like.Cardan grille system(Early Steganography) was used during the American Revolutionary War:

X-rays defeat Letter Locking: The Secret of Ancient Folded Paper X-rays defeat Letter Locking: The Secret of Ancient Folded Paper

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