By Igino Corona, Matteo Mauri
Steganography is a secret mechanism for encoding information by any means of transmission. Its use has been known since ancient Greece and defined in the glossaries towards the end of the fifteenth century. Both encoding and medium of transmission are secret, that is, known only to the parties who intend to communicate in an occult way. Steganography therefore presents itself as an ideal tool for the creation of secret communication channels that can be used in sophisticated espionage scenarios, computer crime, data breaches in public and private sectors.
Steganography differs from cryptography, in which encoding of information and medium of transmission are generally known (think for example to the HTTPS protocol used by this site). In this case, the encoding mechanism makes the extraction of information (extremely) difficult without the knowledge of additional data, known as encryption/decryption keys. These keys are known only to the parties authorized to communicate (for example, your browser and our web server).
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