nemozone

The Tor Project has officially transitioned from its long-standing bridge distribution system, BridgeDB, to a more advanced platform known as Rdsys. This strategic move aims to enhance the network's resilience against evolving censorship tactics and improve overall user accessibility.

The Shift from BridgeDB to Rdsys

BridgeDB, introduced over a decade ago, was initially successful in helping users bypass censorship by distributing bridge addresses—unlisted relays that facilitate access to the Tor network. However, as censorship tactics became more sophisticated, BridgeDB struggled to adapt, leading to technical debt and maintenance challenges. In response to these limitations, the Tor Project began developing Rdsys approximately four years ago.

Rdsys, short for Resource Distribution System, is designed with a modular framework that separates components such as distribution logic and communication methods (e.g., email, Telegram). This architecture allows for rapid experimentation with new distribution channels and tools, enabling the system to swiftly adapt to emerging censorship threats. For instance, in response to increased censorship in Russia, Rdsys facilitated bridge distribution through Telegram, leveraging account history to differentiate genuine users from potential censors.

Key Improvements with Rdsys

One of the most significant improvements with Rdsys is the elimination of captchas, which were previously used in BridgeDB to verify legitimate users. Captchas often posed accessibility challenges for users with disabilities or those facing language barriers. Additionally, censors developed methods to bypass captchas, diminishing their effectiveness. By removing this obstacle, Rdsys enhances both the accessibility and reliability of Tor bridges, ensuring a smoother user experience.

The transition to Rdsys was completed in October 2024, marking the official retirement of BridgeDB. Users can expect a seamless experience as existing distribution mechanisms—such as web-based requests and the Tor Browser's built-in API—remain operational. However, users may notice the absence of captchas when obtaining bridge addresses, reflecting the improved user-friendly approach of Rdsys.

Future Directions

Looking ahead, the Tor Project plans to leverage Rdsys's modular design to introduce new anti-censorship tools and expand bridge distribution channels. The community is encouraged to participate by contributing to development efforts or operating Tor bridges. This collective endeavor aims to maintain an open and accessible internet for all users.

In conclusion, the shift from BridgeDB to Rdsys represents a significant advancement in the fight against censorship. By prioritizing accessibility and adaptability, the Tor Project continues its commitment to providing secure and anonymous internet access worldwide.

Citations: [1] https://cyberinsider.com/tor-project-retires-bridgedb-in-favor-of-rdsys-to-fight-censorship/