Firmware for

The Tablet:
A Secure Communication System

The Tablet is a secure communication device designed to implement the NSAR (Non-Symmetric Accessibility Relation) security policy.

How it works

All data handling components are air-gapped from upstream components to prevent information leakage to any connected device. Asymmetric encryption masks every message sent, and decryption is handled in such a way as to guarantee plaintext is hardware inaccessible to any networked device.

Installing Dependencies

Clone this repository.

git clone git@git.blackboxlabs.dev:/srv/git/tablet.git

Clone Cryptopp into the root of this repository.

cd tablet
git clone https://github.com/weidai11/cryptopp.git

Install Cryptopp by:

cd cryptopp/
make
sudo make install

How to Compile

To compile binaries from our C++ files; use g++, include the cryptopp folder for the headers, and link the cryptopp library like so:

g++ rsa.cpp -o rsa.bin -I cryptopp/ -lcryptopp

To compile README.md and other markdown files with a github aesthetic, first install grip

pip3 install grip

then do:

grip README.md --export README.html

How to use

To generate keyfiles:

./rsa.bin -g name_of_owner

To encrypt a message: (name on keyfile should match name of recipient for convenience)

./rsa.bin -e "your message" -k name_on_public_keyfile -o ciphertext.dat

To decrypt a message:

./rsa.bin -d ciphertext.dat -k name_on_private_keyfile

Contributing

For contributors to the project; do this before making your first commit:

Install pre-commit

cd /path/to/this/repository/
sudo apt install pre-commit
pre-commit install

(we do all of our development on linux)

To test updates to the readme and other GitHub flavored markdown, simply install Grip and feed it your desired file.

pip3 install grip
grip README.md

Then follow the link provided by the Grip sever for a live preview of your work.
When satisfied with your changes you can compile to an html file with:

grip README.md --export README.html

Authors

Gabe M. LaFond - Initial work - ExamDay

See also the list of contributors who participated in this project.

License

This project is licensed under the MIT License - see the LICENSE.md file for details

ExamDay/TheTablet

The Tablet:A Secure Communication System