This preview shows page 1. Sign up to view the full content.
Unformatted text preview: t significant bits of the host image are used to hide the most
significant bits of the hidden image (for image-in-image hiding).
The least significant bits can always be used to hide other data types. + = Copyrights are reserved @ 2010 for Dr.
Alomari, CIS, JU The next example will show how image-in-image hiding works via this
method. 1 IMAGE TECHNIQUES IMAGE TECHNIQUES Store host image and hidden image in memory. Original Images
Bit Level 1
4 Pick the number of bits you wish to hide the hidden image in.
Scan through the host image and alter its LSB’s with the hidden images
MSB’s. So when 4 bits are used to hide information…
Host Pixel: 10110001
Secret Pixel: 00111111
New Image Pixel: 10110011
To extract the hidden image, you basically take out the LSB’s from the
host image and create a new image from them. LIMITATIONS AND ATTACKS BASIC ATTACKS Five categories of attacks: - Robustness attacks attempt to diminish or remove the watermark. - Presentat...
View Full Document
- Spring '13
- Information Security