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Steganography has been widely used for centuries. Here are some examples: This particular form of steganography is called a null cipher.
Messages written in Morse code on yarn and then knitted into a piece of clothing worn by a courier. Messages written on envelopes in the area covered by postage stamps.
In the early days of the printing press, it was common to mix different typefaces on a printed page because the printer did not have enough copies of some letters in one typeface. Thus, a message could be hidden by using two or more different typefaces, such as normal or italic.
During and after World War II, espionage agents used photographically-produced microdots to send information back and forth. Microdots were typically minute less than the size of the period produced by a typewriter. World War II microdots were embedded in the paper and covered with an adhesive, such as collodion.
That was reflective and so was detectable by viewing against glancing light.
Alternative techniques included inserting microdots into slits cut into the edge of postcards. She was a dealer in dollsand her letters discussed the quantity and type of doll to ship.
The stegotext was the doll orders, and the concealed "plaintext" was itself encoded and gave information about ship movements, etc. Her case became somewhat famous and she became known as the Doll Woman. During World War II, photosensitive glass was declared secret, and used for transmitting information to Allied armies.
Jeremiah Denton repeatedly blinked his eyes in Morse code during the televised press conference that he was forced into as an American prisoner-of-war by his North Vietnamese captors, spelling out "T-O-R-T-U-R-E".
Increw members of the USS Pueblo intelligence ship, held as prisoners by North Koreacommunicated in sign language during staged photo opportunities, to inform the United States that they were not defectors but captives of the North Koreans.
In other photos presented to the US, crew members gave " the finger " to the unsuspecting North Koreans, in an attempt to discredit photos that showed them smiling and comfortable. Digital messages[ edit ] Image of a tree with a steganographically hidden image.
The hidden image is revealed by removing all but the two least significant bits of each color component and a subsequent normalization. The hidden image is shown below. Image of a cat extracted from the tree image above. Modern steganography entered the world in with the advent of personal computers being applied to classical steganography problems.
Concealing messages within the lowest bits of noisy images or sound files. The message to conceal is encrypted, then used to overwrite part of a much larger block of encrypted data or a block of random data an unbreakable cipher like the one-time pad generates ciphertexts that look perfectly random without the private key.
Mimic functions convert one file to have the statistical profile of another. This can thwart statistical methods that help brute-force attacks identify the right solution in a ciphertext-only attack.
Concealed messages in tampered executable files, exploiting redundancy in the targeted instruction set. Pictures embedded in video material optionally played at slower or faster speed. Injecting imperceptible delays to packets sent over the network from the keyboard.
Delays in keypresses in some applications telnet or remote desktop software can mean a delay in packets, and the delays in the packets can be used to encode data.
Changing the order of elements in a set. Content-Aware Steganography hides information in the semantics a human user assigns to a datagram. Messages are fractionalized and the encrypted pieces are added as comments of orphaned web-logs or pin boards on social network platforms.
In this case the selection of blogs is the symmetric key that sender and recipient are using; the carrier of the hidden message is the whole blogosphere. Modifying the echo of a sound file Echo Steganography. Skin tone based steganography using a secret embedding angle.
On most systems, there is no visual difference from ordinary text. Some systems may display the fonts differently, and the extra information would then be easily spotted, of course. Using hidden control characters, and redundant use of markup e.
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Steganography (/ ˌ s t ɛ ɡ ə ˈ n ɒ ɡ r ə f i / (listen) STEG-ə-NOG-rə-fee) is the practice of concealing a file, message, image, or video within another file, message, image, or mtb15.com word steganography combines the Greek words steganos (στεγανός), meaning "covered, concealed, or protected", and graphein (γράφειν) meaning "writing"..
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