Voynich is encrypted ENOCH

[Koen G]

One thing - depiction of the Tower of Babel with a spiral staircase is older than Kircher.

For example: Bedford Hours, 1430:

This is a nice parallel, but note the crucial absence of a spire or other roof structure. The whole idea of the Tower of Babel was that it could not be finished because God confused people's languages and scattered them across the earth.