Geometry

The Semaphore Cipher is a visual signaling cipher that encodes letters using flag positions. Each letter of the alphabet is mapped to a unique combination of symbols representing the positions of two flags. Historically, it was used for maritime and military communication, allowing messages to be sent across distances without electronic devices.

In this version, each letter is represented by a pair of symbols based on a standard semaphore mapping. Spaces between words are preserved, but the letters themselves are replaced by their semaphore symbol pairs.

The Spiral Cipher is a transposition cipher that arranges plaintext into a grid of a specified number of columns and reads the letters in a spiral order. Spaces are preserved in their original positions, and padding characters (·) are added only to fill incomplete grid cells to maintain a rectangular shape.

The Map Cipher is a simple substitution cipher that encodes messages using a geographic or visual reference, often overlaying a plaintext message onto a map and extracting letters based on pre-defined coordinates or zones. Each plaintext letter is mapped to a position on the map, and the corresponding symbol, letter, or code from that location becomes the ciphertext. This type of cipher combines geographic knowledge with substitution to obscure the message.

The Keyboard Code is a playful substitution cipher that maps letters to other keys based on their positions on a standard QWERTY keyboard. Instead of using numerical shifts like the Caesar Cipher or keyword sequences like the Kangaroo Cipher, this cipher substitutes each letter according to a physical adjacency or pattern on the keyboard layout.