steganography

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steganography

[‚steg·ə′näg·rə·fē]
(computer science)
The art and science of hiding a message in a medium, such as a digital picture or audio file, so as to defy detection.

steganography

(security)
Hiding a secret message within a larger one in such a way that others can not discern the presence or contents of the hidden message. For example, a message might be hidden within an image by changing the least significant bits to be the message bits.

[Chaffing and Winnowing: Confidentiality without Encryption, Ronald L. Rivest, MIT Lab for Computer Science, 1998-03-22].

steganography

Hiding a message within an image, audio or video file. Used as an alternate to encryption, it takes advantage of unused bits within the file structure or bits that are mostly undetectable if altered. A steganographic message rides secretly to its destination, unlike encrypted messages, which although undecipherable without the decryption key, can be identified as encrypted. For a white paper on the subject written by Neil F. Johnson of George Mason University, visit www.jjtc.com/Steganography. See ScramDisk and social steganography.
References in periodicals archive ?
As to the design of the steganalysis feature, in order to capture the embedding changes more effectively, the proposed steganalysis features all include many feature subsets which are extracted for the detection of stego image from different aspects.
In order to increase the security of the stego image the cover image can be encrypted before embedding the medical data.
In the proposed scheme, same concept has been used to compensate the quality of stego image.
El resultado final de este proceso de sustitucion genera la imagen stego y una clave que registra las posiciones de los pixeles donde se oculto la informacion [7],[8].
where X and Y are random variables representing the cover image and stego image, px and qy represent the probability mass functions of x and y, and gs[MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] is the pixel value.
Currently, there is not a secret image sharing scheme that can change the threshold after distributing the stego images and before recovering the secret image.
In order to know what is the effect of some actions done to stego image, we do some testing on the stego image by changing the brightness and constrast, and also doing crop.
Superposition: the coefficients of the stego signal are obtained as the sum of the coefficients of the host signal and the coefficients of the secret message.
defuzzyficator (Defuz) which convert output of NFS in number Y used as stego way of container of text element image.
STEGO INDUSTRIES MAKES THE GRADE AS NAMED EXCLUSIVE ARIAS SALES PARTNER
Imperceptibility (or fidelity) is referred to the perceptual difference between the stego and original image and can be tested subjectively.