I am always amazed by the pragmatism shown in the creation of the glyphs used in the VMS.
Medieval code glyphs tended to be elaborate. It was almost as if, when deciding to sit down and create a cipher glyph, the average cryptologist would say "the more elaborate, the more over the top and impressive, the more secret it will be".
OK, not always. But you can divide them into two types - the functional and the ornate. The first were designed to be used, the second designed to be shown.
Ornate ones are the impractical ones devised to impress. Look at the Arabian secret writing tradition; or the John Dee's Enochian.
Another is the Alphabetum Kaldeorum, which was a simple 14th century cipher alphabet invented by Austrian king Rudolf IV:
Rudolf is reputed to have claimed that the alphabet was from India, but this appears to have been a misdirection. It's generally assumed that Rudolf invented it (or had someone invent it for him), as he was proud enough of the system to have it engraved on his epitaph. Some have argued that the letter shapes bear a resemblance to the theoretical cipher alphabet of Aethicus Ister, a work which we know about only at third or fourth hand, but which argued for the substitution of letters in order to secure the reading of the text. It's been suggested that the work was written by the 8th century Bishop of Salzburg, St. Virgil the geometer. St. Virgil was actually an Irish missionary who travelled the continent, and who had a major falling out with St. Boniface, who twice denounced him to the Pope for heresy. Other researchers have linked Aethicus Ister to other intellectuals of the period across the whole of Eastern Europe. If so, it's perfectly possible that a copy of his work was studied by someone in Rudolf's court who appropriated his ideas for his masters new code idea.
Although we appear to have no actual diplomatic correspondence written in this cipher, we do have a manuscript from 1428 which, along with some other non-European alphabets, describes the Alphabetum, (it resides at the University of Munich with the not very exciting shelf name of UB München 4° Cod. ms. 810).
These codes weren't designed to blend in, or to be easy to write. They were designed with the idea of secrecy in mind, but with no attempt at ease of use. Note the AK wouldn't be easy to write - we don't have any examples of it in use, but each letter would have to be individually written carefully to avoid confusion. M and Z would be very easy to confuse, as would I and K, etc.
Here's a medieval code from a You are not allowed to view links.
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They are like this because they weren't designed to encode an entire book, only phrases or even words. The idea of encoding a whole book didn't appear until literacy was high enough to warrant this; indeed, in the middle ages the word "cipher" didn't even exist. The idea was always to hide the most important, key point. In all the medieval cipher manuscripts I know of, only key words or phrases are encoded.
For more pragmatic and smoother approaches, we have to wait for the Renaissance. Such as the Spanish diplomatic codes from the 16th century, which substituted abbreviations for phrases in a code book:
That's when codes actually start becoming useful, and people realise that it's a good idea to a) be easy to write and read and b) not stand out too much.
But the Voynich glyphs are different. Obviously they stand out, but they were designed from the very beginning to be easy to write and read.
There is another medieval code which comes to mind, namely the number ciphers used by monks across northern France and You are not allowed to view links.
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But the
notae elegantissimae described above evolved through trial and error. They weren't trying to encode the numerical details (the code was used for counting, such as items in warehouses) but trying to substitute the clumsy Roman notation in use at the time. The code vanished as soon as Arabic numerals came along.
So -
why did the Voynich scribe decide upon a fluid script for his book? It seems a nonsensical question to us today, but it's a completely revolutionary idea for the late middle ages. Did the script evolve? (shout out to Koen!) Or was it designed from the ground up?
I suppose we'll never know, but it's fun to speculate....