After many years of searching, I finally have a viable excuse reason to go to Belgium that doesn’t involve chocolate, waffles, mussels, chips, or beer. And it’s all thanks to the National Security Agency…
I should explain. A few weeks ago, the NSA very generously declassified back issues of its in-house journal “Cryptolog” from August 1974 to Summer 1997 (though admittedly quite heavily redacted in places). Hence I’ve started working my way through them, looking (unsurprisingly) for any Cipher Mysteries stories that haven’t otherwise come to my attention. (Note that there are two Voynich-related snippets listed in the overall index, but these contain nothing obviously new or particularly surprising).
Hence the September 1974 issue of Cryptolog is where I found this particular story. It’s about a church in the Belgian town of Moustier which has a pair of rather curious cryptograms, which Professor Jean Connart (who was writing a history of Moustier), “has been trying since 1961 to discover the meaning” of. Without success, of course.
The first cryptogram is on the church’s St Martin’s Altar (photo by Koen Van de moortel)…
…and the second is on its Virgin’s Altar (photo also by Koen Van de moortel, but scaled up and sharpened by me)…
What’s nice is that the Cryptolog pages answer many of the questions you’d have asked about Moustier Church if you’d had the chance:
According to parish records, the church at Moustier was in such dilapidated condition about 1836 that repairs were needed to/prevent total ruin of the building. In addition, the winds of November 1836 had taken off part of the roof. In June 1838, some work was undertaken “in accordance with the plans of Philibert Pluvinage and Pierre Joseph Lemaitre. “A stonemason (un tailleur de pierre) received board and lodging for 18 days.” (Italics Prof. Connart’s)
In spite of these repairs, the church was (c.1840?) in such poor condition that part of it collapsed when the roof was raised. The contractors had to rebuild the choir and the side chapels (where the altars are) from the ground up.
There is a published report (Moulart, Basecles; Esquisse religieuse) that the ancient altar of St. Martin was sold or offered for sale at Basecles in 1843. Basecles, a Belgian town near the French border, contains the Church of St. Martin which dates from 1779 and is considered the best product of the Tournai School. Does the Moustier St. Martin’s altar come from Basecles? Were both it and the Virgin’s altar constructed in l843? Or does only the stonecutting date from that time? Answers to these questions could have a bearing on the date of the Moustier cryptograms and their underlying message.
Given that we have reasonable photos of these cryptograms (rather than the hand-drawn monochrome copies that appear in the Cryptolog pages) to work with, we’re arguably at an advantage over the NSA right from the start. And from that I can see that the letter carving is really rather… variable. The height of each row of letters seems inconsistent, with the vertical bars on the U in “LUBΓPNID” plainly different lengths; each row is 7, 8 or 9 characters long; there seems to be no obvious rationale as to whether individual characters have serifs or not; while some characters appear to be formed of merged pairs of letters, possibly accidentally (copying ciphers onto paper is hard, let alone onto stone) or deliberately (to squeeze them into a rectangle), it’s hard to tell.
Yet from the distinctive ‘R’ shape, and the closeness of the match between the materials and framing motif, I think it very likely that the two were carved by the same person at basically the same time.
If you want to take this on, here are my (provisional) transcriptions. I’ve transcribed the “Γ” character as ‘F’, the “Λ” character as “^”, and the composite “Γ-merged-with-L” character as “[“. And being in Belgium, you’ve got Flemish, French, German, and Latin (at least) to choose from as possible plaintext languages. Just be grateful that the dating seems to rule out Klingon.
Moustier Church, St Martin’s Altar cryptogram
J N L K B F P R
V M G H W H[
Q L S B N F HP
M G [ K H V R
^ L R N F S X VP F V B L P M R
R A [ G K T D
B N D F J V R W
L U B F P N I D
C [ T R ^ Q M
Moustier Church, Virgin’s Altar cryptogram
L F E G K R V Q
Y P Z H N R L B D
M F ^ N V D [
N ^ P V J H M ^
L F N ^ B K PN C L X B P D W
R N [ C H Z R P
M D X R ^ P L N
H F ^ L D N X W
E N L V N D ^ P N
As far as the transcription goes, I’m far from sure about what’s going on here. I have a sneaking suspicion that part of the mystery might arise from a laziness in the carver, because “E” only appears in the Virgin’s Altar, while “[” appears twice as much in St Martin’s Altar. That is, might “[” simply be a lazy ‘E’, and “^” a lazy “A”? Or might “[” instead be a merged “L + Γ” pair?
As far as letter frequencies go (~27 unique shapes used):
16: N
12: P / L / R
10: F / ^ (note that I included the one instance of ‘A’ in the count for ‘^’)
9: V / D
8: B / H
7: M
6: [
5: K
4: W / X / G
3: J / C/ Q
2: Z / S / T/ E
1: I / Y / U
As far as the cryptanalysis goes, there are quite a few patterns:
3-grams: BFP (2 instances, both in the St Martin’s Altar cryptogram)
2-grams: R^ (4 instances), ^P, PN, ^L, PM (3 instances), plus 14 other 2-grams that repeat once.
PS: Koen Van de moortel describes the cryptograms as a “table with 700 year old secret code, referred to in the “Centuries” from Yves de Lessines, stolen and published by Nostradamus“. Basically, the story there is about a 14th century Cistercian monk called Yves de Lessines, whose book “Les Centuries” Rudy Cambier (of the University of Liège) recently claimed was reused by Nostradamus for his Prophecies. Cambier also claims in his book that “Les Centuries” also describes where the Knights Templar hid their treasure. Just so you know!
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