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By Matteo Mauri, Igino Corona, Davide Ariu
Stegomalware (or stegware) is a particular and sophisticated type of malware (malicious / unauthorized software) that uses steganography to evade detection and secretly exchange information.
Steganography was already used in ancient Greece and defined in the glossaries towards the end of the fifteenth century. In essence, it is a secret mechanism for encoding information through any means of transmission. Both the encoding and the transmission medium are secret, that is, known only to the parties who intend to communicate in an occult way.
In this sense, it differs from cryptography, in which the encoding of information and the transmission medium are generally known (e.g., the HTTPS protocol used by this website). In this case, the encoding mechanism makes the extraction of clear-text data (extremely) difficult without the knowledge of additional information, known as encryption / decryption keys. These keys are known only to the authorized communication parties (for example, your browser and our web server).
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