Image Steganography

This is a small application written as a steganography exercise. Nothing fancy, just a bit of fun.

Currently supports:

• BMP (BM header only)

Refernce Links

Useful references used when working on this project

• Ruby Pack/Unpack
• BMP File Format
• Working with Binary Files Example
• rspec expect vs expect block Hadn't come across this before strangely!
• jpeg interchangeable file format
• jpeg file format

Setup / Run

bundle install
bundle exec rake

Encode a message

ruby stegography.rb 10x10.bmp e "Super secret!"

Encode a message from file

ruby stegography.rb 10x10.bmp e "${cat test.txt}"

Decode a message

ruby stegography.rb modified-10x10.bmp d

Image file name: modified-10x10.bmp
Decoding Message...
Super secret�.�������;�����

Example

Original

Modified