200-Year-Old Cipher Finally Cracked

Attila Dimedici writes "A code expert just cracked a code used by a friend of Thomas Jefferson in a letter written to Jefferson some 200 years ago. This code is fairly easy to crack using a computer, but extremely difficult without one. I think it would have been much harder if the author had not included an indication as to what code algorithm he used in the letter accompanying the coded message."

Comments

tl;dr

[Anonymous Coward]

The message says:

"In Congress, July Fourth, one thousand seven hundred and seventy six. A declaration by the Representatives of the United States of America in Congress assembled. When in the course of human events..."

Re:tl;dr

[morgan_greywolf]

FTFA:

After about a week of working on the puzzle, the numerical key to Mr. Patterson's cipher emerged -- 13, 34, 57, 65, 22, 78, 49.

Hey! That's the combination to my luggage!

Wake me when the Voynich is cracked

[netsavior]

the Voynich manuscript is a much more compelling and difficult mystery.

Re:Wake me when the Voynich is cracked

[jd]

Perhaps, but there's no evidence that the Voynich manuscript is a cypher in the traditional sense. A natural language isn't normally "decyphered", since it was never encrypted in the first place.

Given that there are many hundreds of thousands of natural languages today for which there is no written form, it's entirely possible that this is a script invented for such a language. In WW2, natural native American languages were sometimes used in this way as an "unbreakable cypher" - who's to say that medieval Europeans hadn't done the same thing themselves?

If that is the case, then it isn't particularly compelling (we know of many extinct languages for which no known writing exists - and hundreds more go extinct yearly), and is not so much "difficult" as useless - the text could never be read.

The wikipedia article doesn't say anything about using techniques to detect writing that is no longer visible, so I must assume no such techniques have been used.

(It may be possible to establish some of the content of a missing page if the page after had been underneath at the time of writing. Non-destructive techniques for doing this formed a part of the case against the West Midland's serious crime squad in the 90s, where it could be shown pages of confessions had been altered after being signed. However, if no such analysis has taken place, the presence of such data is unknown.)

Regardless, there are many missing pages. From the articles, the page numbers seem to be relatively new compared to the text, so we don't know how many pages are actually missing, we only know how many went missing since being numbered. This makes understanding the text very difficult and even if the text could be translated, there's no guarantee we could even read it or understand it without those pages.

We know vastly more about Linear A than we do about the script on the Voynich manuscript, including the archaeology of the people writing Linear A, yet after all this time we've got no further than knowing the number system and a few of the numbers in it.

just cracked??

[macxcool]

A code expert just cracked a code

The article says "After unlocking its hidden message in 2007". This is hardly 'just'. The solution was more recently published though. Interesting article.

Re:just cracked??

[gEvil (beta)]

What? You actually expect the article submitter to RTFA?

Re:just cracked??

[bitt3n]

A code expert just cracked a code

The article says "After unlocking its hidden message in 2007". This is hardly 'just'. The solution was more recently published though. Interesting article.

he's obviously using the same definition of "just" that I use when I tell my wife I just took out the garbage so get off my back

Contents of message

[wjousts]

"Hey Jefferson, you might want to try keeping it in your pants. I saw that slave girl today and she's starting to show. People will start asking questions."

Re:Security by obscurity

[phantomfive]

Obscurity IS a level of security, which is good, but it's only one level. Hopefully you have a security system that is robust enough that even when the obscurity is pierced, it is still secure. In the past when people complain about Microsoft depending on security through obscurity, they were referring to the fact that Windows was at one time so insecure that it was only a matter of obscurity that gave it any security at all. That isn't to say obscurity is all bad for security.

In this case, unless you knew the key, it would have been extremely time consuming to discover the solution, even if you knew the algorithm used. Notice it took the guy a week to solve it, even with a computer, and modern cryptanalysis techniques.

The trick was finding the decoder ring

[rev_sanchez]

The message was: "Be sure to drink your Ovaltine."

Could have been done earlier

[houghi]

... but they had to wait for the copyright to expire.

Zodiac Killer 360

[Korey Kaczor]

The elusive Zodiac Killer's 360 character cipher was never cracked, either, and it's been decades since he mailed it to newspapers. That cipher also seems a bit grid-like, with spacing made deliberately in rows. I wonder if this method would help, at least in part, in cracking it?

If anything, would be nice to see something come up to ascertain his identity, and if alive, put him behind bars.

Jefferson wrote the Declaration of Independence

[tyrione]

He wrote the entire draft. The only parts that changed were minute portions and the choice of language he used was replaced by less forceful language for fear of being too alienating to the common man. The WSJ cites him as a contributor. The author needs to read Jefferson's letters. It's right in there. I suppose Stephen King or any other author should be called a contributor to their work after an Editor comes in and helps modify it.