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