Steganography

Polygraphia

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Polygraphia is a historical treatise on cryptography and steganography written by Johannes Trithemius, a German abbot and scholar, in the late 15th century. The word polygraphia is derived from Greek, where poly means many and graphia means writing reflecting the treatise's focus on various methods of secret writing and communication.

Pinprick Cipher

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The Pinprick Cipher is a basic and straightforward form of secret writing, often used for encoding messages in a discreet manner. It involves using a pin or a sharp tool to create small holes or dots on a piece of paper in a specific pattern to represent letters, numbers, or symbols.

To use the Pinprick Cipher, each letter, digit, or symbol in the plaintext is assigned a unique pattern of holes or dots. The pattern could be based on a predefined code, a secret key, or any agreed-upon method between the sender and recipient.

Steganography