7Guard

7Guard - OTP encryption software

Getting Started

Requirements

• git
• make
• Doxygen (optional, only if you want to generate the docs)

Build

git clone https://github.com/Samega7Cattac/7Guard-Core.git
cd 7Guard-Core
make

And you should have 7Guard inside build folder. Works on Linux, Windows (#4) and MacOS (#3).

How it works

7Guard uses a encryption tecnique called OTP (One-Time-Pad) which sums the bytes from the file with a random number, saving the sum to the crypted file and the random number will be used as the key file.

file_to_crypt + random_number = crypted_file
                      |               |
                      |                -->Stored in crypted file (*.7cy)
                       ------------------>Stored in key file (*.7ky)

To decrypt it's just inverting the process.

original_file = crypted_file - random_number

The issues with this tecnique are:

• Generation of truly random numbers
  • The problem was solved by using the Intel functions to generate random numbers in hardware level (more info here).
• The crypted and key file will have the same size of the original one.
  • In this version you need to deal with it. I'm already working on a implemetation with a server (more for enterprise use) where the keys will be stored on the enterprise server.

Usage

Options:
        -crypt - path to the file to crypt
        -decrypt - path to the crypted file
        -key - path to the key file (only with "-decrypt")
        -h - display this help message
Usage:
        7Guard [ -crypt <file_to_crypt.*> | -decrypt <file_to_decrypt.7cy> -key <file_with_key.7ky]

Optional:
        -o - Path to output folder
        -i - percentage refresh time in secs
        --buf - specify the size used for each of the 2 buffers (O = max)
        --threads - EXPERIMENTAL, uses threads with a limited number of blocks in queue (O = default)
                (Only high-end CPUs recomendaded)

make options:

make        - build targeted for release
make debug  - build targeted for debug
make docs   - generate docs using Doxygen
make clean  - cleans the current build

Versioning

For the versions available, see the releases on this repository.

Authors

• Samega 7Cattac - Initial work - Samega 7Cattac

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

License

This project is licensed under the GNU General Public License v3.0 License - see the LICENSE file for details

7Guard Copyright (C) 2019 Samega 7Cattac