Steganography Steganography Bacon's cipher or the Baconian cipher is a method of steganography (a method of hiding a secret message as opposed to a true cipher) devised by Francis Bacon. A message is concealed in the presentation of text, rather than its content. ...more on Wikipedia about "Bacon's cipher"
A canary trap is a method for exposing an information leak, that involves giving different versions of sensitive information to each of a group of suspects and seeing which version gets leaked. ...more on Wikipedia about "Canary trap"
In cryptography, a Cardan grille is an important tool in the reading of a message obfuscated through steganography. Introduced in 1550 by Renaissance mathematician Gerolamo Cardano (also known as Jerome Cardan), the grille is usually a card perforated with holes at selected places. To decrypt a message, the card is laid over the page of text that contains a hidden message, reading only the letters that appear through the holes in the grille. ...more on Wikipedia about "Cardan grille"
Chaffing and winnowing is a cryptographic technique to achieve confidentiality without using encryption when sending data over an insecure channel; it was conceived by Ron Rivest. It can be viewed as a form of steganography. ...more on Wikipedia about "Chaffing and winnowing"
In information theory, a covert channel is a communications channel that does a writing-between-the-lines form of communication. ...more on Wikipedia about "Covert channel"
Invisible ink is a substance used for writing, which is either invisible on application, or soon thereafter, and which later on can be made visible by some means. The use of invisible ink is a form of steganography, and has been used in espionage. ...more on Wikipedia about "Invisible ink"
Jpegx is a freeware application that allows users to hide messages in jpeg files. It was first released on October 30 2001, the original version 1.0.6 was deciphered by Guillermito . Jpegx 2.0.3 had a password bypass vulnerability in its wizard. Jpegx 2.1.1 was released without a wizard. ...more on Wikipedia about "Jpegx" The Ultimate shortopedia Machine.
:Alternative meanings: A microdot is a form of LSD. ...more on Wikipedia about "Microdot"
A null cipher is an ancient form of encryption where the plaintext is mixed with a large amount of non-cipher material. It would today be regarded as a simple form of steganography. Null ciphers can also be used to hide ciphertext, as part of a more complex system. ...more on Wikipedia about "Null cipher"
Printer steganography is a type of steganography produced by color printers, including HP and Xerox brand printers, where tiny yellow dots are added to each page. The dots are barely visible and contain encoded printer serial numbers, as well as date and time stamps. ...more on Wikipedia about "Printer steganography"
Steganalysis is the art and science of detecting messages hidden using steganography; this is analogous to cryptanalysis applied to cryptography. ...more on Wikipedia about "Steganalysis"
Steganography is the art and science of writing hidden messages in such a way that no one apart from the intended recipient knows of the existence of the message; this is in contrast to cryptography, where the existence of the message itself is not disguised, but the meaning is obscured. ...more on Wikipedia about "Steganography"
Originally based on the British "Airgraph", V-mail was an unusual system for delivering mail from United States troops to home addresses during World War II. It worked by photographing large amounts of censored mail onto reels of film, which weighed much less than the original would have. The film reels were shipped to the US, printed out on lightweight photo paper and delivered to the addressee. V-mail itself is a combination of letter and envelope. The user would write in the perscribed space, fold the letter/envelope, address it and then the mail was on its way. ...more on Wikipedia about "V-mail"
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