Simple Square Cipher

Five Square Starter

The Magic Square wherein numbers sum to the same figure in rows and columns - and even diagonally - has been a curiosity for centuries. Heinrich Cornelius Agrippa von Nettesheim provided this Square of Mars that sums to 5 x 13 in all directions using the numbers 1 to 25. He served as a secretary to the Holy Roman Emperor Karl V.

Put letters into the square in the sequence 1 to 25 and you have a cipher jumble:

EESUP HTSEI NESAC RSCER RRQIS

This is not really easy or practical. There are other arrangements of 25 letters in a 5 x 5 square. Have a look at this SIMPLE NOTE.

https://simplebooklet.com/sumsandshapes

The Square of Mars

CIPHER SECRETS SET IN SQUARES