Shared Secret in Images with Steganography

Cryptography and Security Project

Getting Started

These instructions will install the system in your local machine.

Prerequisites

1. Install Maven, if you haven't yet

   Mac OS X

   brew install maven
   

   Ubuntu

   sudo apt-get install maven
   

   Other OSes

   Check https://maven.apache.org/install.html.

2. Clone the repository or download source code:

git clone https://github.com/lipusal/tp-cripto.git

Installing

1. Change working directory to project root (i.e where pom.xml is located):

   cd <project-root>
   

2. Let maven resolve dependencies:

   mvn dependency:resolve
   

3. Create jar file

   mvn clean compile assembly:single
   

Usage

The application can be executed running java -jar <path-to-jar> <program parameters>. It can be configured in order to execute in different modes. This is done including parameters. The following sections will describe these modes.

Displaying usage message

You can display the usage message by setting the -h or the --help parameters. Example of usage:

java -jar <path-to-jar> -h

Indicating action to perform

It can either be to recover a picture from some given shadows or to distribute a secret picture among other shadow pictures

Options are:

• To recover -r
• To distribute -d

Indicating output file

If used with -d, the image to distribute. If used with -r, the output file for the recovered image.

-secret <secretFileName>

Indicating k

K is the minimum number of shadows needed to retrieve the picture

-k K

Indicating n

Only allowed when used with -d. Total number of shadows to generate. If not provided, will make n the number of pictures in the specified directory.

-n N

Indicating Directory

If used with -d, directory containing images where secret will be distributed. If used with -r, directory containing images from which to recover the secret. In either case, default is current directory. (default: ./)

-dir <path>

Authors

• Juan Li Puma
• Martin Goffan
• Natalia Navas
• Francisco Bartolomé