20-03-2012, 04:08 PM
Visual Steganography
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Based on a mixture of steganography and visual
cryptography
– Existence of messages is hidden, but no software is
necessary to extract them
• Uses ultraviolet light to project messages, images,
etc onto cover media
• While invisible to the naked eye, messages may
be seen through special eyewear
Issues
• Actual projection
• Dealing with media (post-projection)
– New Idea: projection through other media
• Making UV visible
• Seeing UV and Visible simultaneously
• Secret Keys
Background on Light
• Four different things happen when light hits an
object:
– It is reflected/scattered
• Electrons send light back out at same wavelength
– It is absorbed
• Electrons of material absorb light waves
– It is refracted
• Light waves are bent, electrons send light back out
– It is transmitted
• Wave passes through the material unchanged
Actual Projection
• Visible light slide projection
– light is projected through material that transmits or
reflects/absorbs visible light
• Colors transmit only color wavelength, black absorbs all
waves
• UV light projection
– UV light is projected through material that transmits
or reflects/absorbs UV rays
• In accordance with picture, words, etc. to be projected