What is digital steganography?
The word digital describes a sound, image, or data file that can be stored electronically, unlike a file in another medium such as a photo printed on photographic paper. The term steganography comes from Greek words, which means "to cover" and "writing". Refers to the practice or art of hiding a message in any medium. Digital steganography concerns hiding a report in digital format.
Steganography comes from at least Herodotus, which mentions the use of tattooed reports on shaved Slaves shaved managers - the news that they hid, as well as absurdly in wooden and covered wax. Steganography , when it was first used in English in the sixteenth century, referred to cryptography - writing in codes and encryption. Currently, the word mainly concerns messages that are not visible. Although such messages can also be encrypted, this is not necessary, and this applies to digital steganography, where the main purpose is often to createt message that defies the detection.
Digital steganography uses the fact that in a number of file formats the data is edited or some data have little important and hidden message does not cause noticeable file changes. It is used, for example, in graphics files, HTML, audio files, video and text files, but image files are preferred and referred to as Stego-Images . Digital steganography is said to have played a role in planning Al-Qaeda, which led to attacks of 11 September 2001 on the United States. Digital steganography is also used by people who are censored by governments and government agencies, criminals and for other reasons.
digital steganography is related to hidden digital watermark, but watermark often uses smaller news and has different purposes - often copyright, although to some extent they are interchangeable. There is special software that allows the practice of digitalSteganography, and this can allow you to hide the report within the digital watermark, although other methods may be more common. Some software of digital steganography is better than another when hiding messages efficiently.
The counterpart of the software of digital steganography is the technology and technology of digital steganalysis. Digital steganalysis is the art of detection and extraction of steganography. It is used by governments, news agencies, law enforcement and army. There is also training for people who want to be certified in the detection and extraction of steganography.