OK.
This takes way too long.
1)
Breaking cryptography-based
computer programs
o
Codebreaker challenge 2013: file,
how-to
(the instructions are in the 2nd half of the PDF file, be patient);
o
My variant: file; use the
same skills to break it and then follow the instructions that you have found
3)
Visual cryptography examples:
a) based on
standalone Java application(posted on Nov. 13,
2017; after downloading it, just double click on the file or if
you are not allowed to run it directly [such as on Mac], open a terminal, go to
the “Downloads” directory, and type in java -jar
jmucsvc-obf.jar),
