Span
Each symbol is replaced by the two symbols the given number of positions away on the circular layout.
a → od
QWERTY / S2 / R0 / N
PLAINTEXT INPUT
What do you want to encode?
CIPHERTEXT OUTPUT
Result
Your result will appear
here…
REFERENCE
Character mapping
FIELD NOTES
How it works
Rotation
After finding the pair, each output symbol can move forward through the layout. Rotation 0 leaves it unchanged.
a → od → (R2) gj
Direction
Normal emits the left symbol first. Reversed emits the right symbol first. Decoding validates both sides converge.
N: od REV: do
Bruteforce
With a known layout, every valid key is decoded and ranked by a lightweight English readability score.
valid pair → score → rank