sergeyivanovdevelop / blockchain-crypto-messanger

This repository contains the code and configuration for deploying and running the Blockchain Crypto Messanger project, which is a node of the blockchain network.

Blockchain Crypto Messanger "Geekon"

Blockchain Crypto Messanger ·

This repository contains the code and configuration for deploying and running the Blockchain Crypto Messanger project, which is a node of the blockchain network.

The project is composite and includes the following components:

• BCM-Linux-Console (C, C++, Python, I2Pd, Yggdrasil)
• Android-Client (Android Studio, Java)

The main features of this messenger are:

• There is no need for miners to make a decision in the consensus process
• Solved the problem* of the ever-growing size of the blockchain (* - it periodically resets when a certain number of transactions is reached)
• Encryption using one-time pads is used (i.e. even quantum computers will not be able to decrypt messages ever entered the blockchain)
• Solved the need for a constant key exchange-one-time pads (only a one-time key exchange is needed) thanks to a distributed data storage system (more details will be described in a future article or read the source code)
• Added implementation of distributed data storage running on top of Yggdrasil mesh network (SSL + ipv6)
• Added the ability to put large files in a distributed storage, create small link files on them and send them on the blockchain, and the recipient, if necessary, will be able to request them from the distributed storage
• Added the ability to remotely control the node without losing the level of security (encryption using one-time pads)
• Anonymity in the project is provided by the blockchain network, as well as the i2p network.
• All information about the node is concentrated in the SQLite database encrypted with AES-256 and, if necessary, transferring the messenger to another device will not be difficult.
• Added basic protection against keylogger when entering a password from the database.

General functional model

Network architecture

At the moment, a decision has been made to abolish the central server, and users who want to communicate must exchange address and key information in person or through a trusted communication channel.

Sending message

Functioning of distributed storage

Reference file structure

Checking messages addressed to a user

Key features of BCM

Security level

🖥️ BCM-Linux-Console part of the project

This part of the project is its core and is designed to deploy a node in the blockchain network and communicate with other network participants.

Full list of provided functionality:

• Deployment of a blockchain network node participating in the consensus process, in which there is no need for miners and complex calculations
• Providing the console interface of the messenger
• Ability to add users to the messenger, change user keys
• Ability to change node management to a remote (Android device)
• Encryption of information using one-time pads (protection against quantum cryptanalysis)
• The ability to use a distributed data storage in the Yggdrasil mesh network, as well as act as a member of this storage
• Periodic blockchain update
• DB encryption AES-256
• Using the anonymous network i2p
• Additional protection against timing attacks

📱 Android-Client part of the project

This part of the project is its core and is designed to deploy a node in the blockchain network and communicate with other network participants.

Full list of provided functionality:

• Possibility of remote control of a blockchain network node via WiFi while maintaining the level of security of transmitted information (encryption using one-time pads)

🎬 Example using (GIF):

This animation demonstrates scenarios for using the BCM-Linux-Console.

This animation demonstrates scenarios for using the Android-Client.

📑 Licence

Blockchain Crypto Messanger "Geekon" is CC BY-NC-SA 3.0 licensed.