A keyring encodes a message as deltas — each number is the shift from the previous letter (A=0 … Z=25, wrapping). Format: KRNG: followed by dash-separated numbers, e.g. KRNG:3-1-11-19-0 → DELTA
Turn plain text into a keyring string. Uppercase A–Z only; other characters are skipped.
Paste a grid pattern. Use any non-space, non-dot character (e.g. o, #, *) for a mark and . or space for empty ground. One row per line.