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Steganography is an information hiding technique in which secret data aresecured by covering them into a computer carrier file without damaging the fileor changing its size. The difference between steganography and cryptography isthat steganography is a stealthy method of communication that only thecommunicating parties are aware of; while, cryptography is an overt method ofcommunication that anyone is aware of, despite its payload is scribbled.Typically, an irrecoverable steganography algorithm is the algorithm that makesit hard for malicious third parties to discover how it works and how to recoverthe secret data out of the carrier file. One popular way to achieveirrecoverability is to digitally process the carrier file after hiding thesecret data into it. However, such process is irreversible as it would destroythe concealed data. This paper proposes a new image steganography method fortextual data, as well as for any form of digital data, based on adjusting thebrightness of the carrier image after covering the secret data into it. Thealgorithm used is parameterized as it can be configured using three differentparameters defined by the communicating parties. They include the amount ofbrightness to apply on the carrier image after the completion of the coveringprocess, the color channels whose brightness should be adjusted, and the bytesthat should carry in the secret data. The novelty of the proposed method isthat it embeds bits of the secret data into the three LSBs of the bytes thatcompose the carrier image in such a way that does not destroy the secret datawhen restoring back the original brightness of the carrier image. Thesimulation conducted proved that the proposed algorithm is valid and correct.

Image Steganography Method Based on Brightness Adjustment