17 Puzzle - Agent

At its simplest level, the puzzle presents the solver with a seemingly innocuous block of text, a grid of numbers, or a series of images. The only clue given is the name: .

Happy decoding.

Let’s return to our example grid of numbers 1-26. Most solvers will try to convert numbers directly to letters (A=1, B=2… Z=26). That yields gibberish. agent 17 puzzle

Agent 17 refers to a specific cipher: the Polybius square . Invented by the ancient Greek historian Polybius, it is a simple substitution cipher that maps letters to coordinates in a grid. Typically, a 5x5 grid (combining I and J) uses numbers 1-5 for rows and columns. At its simplest level, the puzzle presents the

Now, to read the message, you take the string KXJ XZW LXV . Convert each letter to its position in the alphabet (K=11, X=24, J=10...). Then, break those numbers into prime coordinates. For example, 11 becomes (1,1) but 1 is not prime. So you fail. So you try the opposite: convert the original grid numbers into letters via prime coordinates. Let’s return to our example grid of numbers 1-26