1) Classical cipher
Found on
https://www.crosswordclues.com/clue/tabula-recta
In cryptography, the tabula recta (from Latin tabula rēcta) is a square table of alphabets, each row of which is made by shifting the previous one to the left. The term was invented by the German author and monk Johannes Trithemius in 1508, and used in his Trithemius cipher. == Trithemius cipher == The Trithemius was published by Johannes Trithem...
Found on
http://en.wikipedia.org/wiki/Tabula_recta
No exact match found.
