ratc.zip - contains executable RATC
program and an example.
1) Download ratc.zip and uncompress it. The following files will
be extracted:
mickey.bmp
- an example image.
mickey_modified.bmp - mickey.bmp authenticated, and modified.
ratc.exe
- ratc program
runtest.bat - sequence
of operations to test the program
2) Execute runtest.bat. It will execute the following operations:
::authenticate mickey.bmp using secretkey=7, yielding
mickey_marked.bmp
ratc s mickey.bmp 7
mickey_marked.bmp
::verify the authenticity of mickey_marked.bmp, and extract
the cover image mickey_recovered.bmp
ratc v 7 mickey_marked.bmp mickey_recovered.bmp
::try to verify the authenticity of mickey_modified.bmp
ratc v 7 mickey_modified.bmp mickey_modified_recovered.bmp