Board Thread:Fun and Games/@comment-39133133-20191005201107/@comment-29916446-20191014233731

heres the details of my top secret vigenere-like cipher (now called Cahill)

its vigenere, but the letters corresponding with the rows and columns are reordered (note: not the rows and columns themselves) and the space and the numbers 0-9 are included in the grid, and both of these changes make it harder to brute force (note 2: the rows are used for the plaintext, the columns for the key)

so you'd have 3 keys sent (row order, column order, key, in the order listed here)