Method and apparatus for preventing data leakage faciliated by steganography
AssigneeSymantec Corporation
InventorAmit Verma
Life of this patent
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Abstract
A method and apparatus for preventing data leakage facilitated by steganography is provided. In one embodiment, the method for preventing data leakage caused by steganography without perceptual quality degradation comprises processing content being transmitted from a computer, wherein the content comprises steganographic data; and before the transmission, modifying the steganographic data to corrupt hidden information within the content without perceptual quality degradation.
Claims20
A method for preventing data leakage caused by steganography without perceptual quality degradation, comprising:
- processing content being transmitted from a computer, wherein the content comprises steganographic data;
- and
- before the transmission, modifying the steganographic data to corrupt hidden information within the content without perceptual quality degradation, wherein modifying the steganographic data comprises accessing carrier modification information that indicates at least one acceptable perceptual quality for the content after modification, and wherein accessing the carrier modification information comprises establishing a peak signal to noise ratio (PSNR) value, wherein the peak signal to noise ratio (PSNR) value indicates a number of bits of redundant data within the content that is to be modified in order to corrupt the steganographic data without perceptual quality degradation.
An apparatus for preventing data leakage caused by steganography without perceptual quality degradation, comprising:
- a memory comprising carrier modification information that is used to determine at least one bit of steganographic data to modify without perceptual quality degradation of content, wherein modifying the steganographic data comprises accessing carrier modification information that indicates at least one acceptable perceptual quality for the content after modification;
- data leakage prevention software residing in a non-transitory computer-readable medium for modifying the at least one bit of the steganographic data based on the carrier modification information to corrupt hidden information within the content;
- and
- a perceptual quality module for computing a peak signal to noise ratio (PSNR) value based on accessing the carrier modification information, wherein the peak signal to noise ratio (PSNR) value indicates a number of bits of redundant data within the content that is to be modified in order to corrupt the steganographic data without perceptual quality degradation.
A system for preventing data leakage caused by steganography without perceptual quality degradation, comprising:
- a user computer for transmitting content, wherein the content comprises steganographic data;
- a filter, comprising:
- data leakage prevention software residing in a non-transitory computer-readable medium for modifying the steganographic data before transmission of the content to corrupt hidden information within the steganographic data based on carrier modification information, wherein the carrier modification information indicates at least one bit of the steganographic data to modify without perceptual quality degradation of the content, wherein modifying the steganographic data comprises accessing carrier modification information that indicates at least one acceptable perceptual quality for the content after modification;
- and
- a perceptual quality module for computing a peak signal to noise ratio (PSNR) value based on accessing the carrier modification information, wherein the peak signal to noise ratio (PSNR) value indicates a number of bits of redundant data within the content that is to be modified in order to corrupt the steganographic data without perceptual quality degradation.
Dependencies are inferred from the claim text.