Chat application without network, no SIM, no account

Jack Dorsey, co-founder of Twitter and current CEO of Block., has just introduced Bitchat, a decentralized messaging app for offline situations. Unlike traditional apps that rely on the internet, Bitchat uses a Bluetooth mesh network to connect nearby devices, completely without the need for Wi-Fi, 4G, or a central server.

Bitchat connects nearby devices via Bluetooth mesh, allowing messaging even when there is no signal or Wi-Fi.

Bitchat devices will automatically detect each other within close range, connect and form an internal network. When sending messages, if the receiving device is out of direct Bluetooth range, the system will automatically forward the content through intermediate devices (a method called mesh routing) allowing to extend the transmission range up to 300 meters.

The app doesn’t require users to create an account, doesn’t ask for a phone number, email, or any personal information. Just install it, turn on Bluetooth, and choose a hashtag as the chat room name, and users can start sending messages to others nearby. The data isn’t stored permanently, but will automatically disappear from the device after a short time.

Bitchat's highlight is its security mechanism. Messages are end-to-end encrypted using strong algorithms such as Curve25519 and AES-256-GCM, ensuring that only the sending and receiving devices can read the content. Intermediate devices act as relays but cannot decrypt. The application also does not collect data, does not display ads, and does not integrate user tracking.

Bitchat is especially useful in situations where connectivity is poor or limited, such as remote areas, natural disaster areas, crowded events, or where there is a risk of surveillance. The complete removal of the middleman infrastructure allows users to maintain communication even when the internet is unavailable or access is blocked.

While the idea of Bluetooth mesh is not new, Bitchat is gaining a lot of traction due to its clear focus on privacy and freedom of communication. The fact that the app is developed by Jack Dorsey – a long-time advocate of decentralized solutions – further strengthens the belief in this different direction.

Bitchat is currently in a limited beta phase. The iOS version has already reached 10,000 installs via the TestFlight platform. The Android version is being developed in parallel, while the app's source code has also been released on GitHub for community input.

The emergence of Bitchat shows that there is still a need for a network-agnostic messaging tool. With its ease of use, strong security, and ability to work offline, Bitchat is opening up a new approach to digital communication where users have complete control over their data.

Source: https://khoahocdoisong.vn/ung-dung-chat-khong-can-mang-khong-sim-khong-tai-khoan-post1553916.html