Resumen
This article focuses on steganography and steganalysis. The rise of the Internet and multimedia techniques in the mid-1990s has prompted increasing interest in hiding data in digital media. Early research concentrated on watermarking to protect copyrighted multimedia products such as images, audio, video, and text. Data embedding has also been found to be useful in covert communication, or steganography. Compared to watermarking, steganography has drawn less attention until recently, as computer specialists, signal-processing researchers, and multimedia product vendors concerned about information security have recognized that illicit use of the technique might become a threat to the security of the worldwide information infrastructure. Researchers have thus begun to study steganalysis, or the detection of embedded information. Steganography also differs from cryptography, which does not conceal the communication itself but only scrambles the data to prevent eavesdroppers understanding the content. Images are the most popular cover media for steganography and can be stored in a straightforward bitmap format such as BMPor in a compressed format such as JPEG.