An Overview of Steganography through History

Steganography is the science of hiding information. The information can take any form and type including images, audio files, and texts. The practice of hiding information is not new and has taken uncommon ways to hide secret messages. People used to convey secret information on rabbits' stomachs and the scalp of slaves. In this paper, we briefly examine the history of steganography from a technical perspective. We focus specifically on the classification adapted to categorize the techniques used in steganography. We concisely touch on null ciphers and digital carriers.