What is Tor Browser?
Tor Browser is a modified version of Mozilla Firefox specifically designed to access the Tor network, a voluntary infrastructure made up of thousands of servers called relays that routed and encrypted traffic. Its main objective is to hide the actual IP address of the user and to make any attempts to monitor or track by third parties, governments or advertisers difficult.
How Tor works
When a connection is started by Tor Browser, the traffic passes through three types of nodes: the input node (guard relax), the intermediate node (middle relax) and the output node (exit relax). Each node only knows the previous and the next node in the chain, so no point knows both the origin and the final destination. In addition, the data are sent in layers of encryption similar to those of an onion, hence the name «The Onion Router».
Advantages of using Tor Browser
- Strong anonimate: the user's public IP is hidden, which protects against mass surveillance and the tracking of advertisers.
- Censorship: in countries where certain websites are blocked, Tor allows access to restricted information when routing traffic outside national borders.
- Access to .ion services: sites hosted exclusively within the Tor network, such as Whistleblowing forums or digital libraries, are only achievable through this browser.
- Fingerprinting protection: Tor Browser includes measures such as the same window size for all users and the deactivation of technologies that can reveal unique browser features.
Limitations and considerations
- Reduced speed: multiple jump and encryption add latency, so navigation can be slower than in a conventional browser.
- Unencrypted output: the traffic between the output node and the final destination travels in flat text if the site does not use HTTPS, which exposes the data to who controls that node.
- Correlation risk: Although difficult, an attacker with the ability to observe both the input and the output may try to correlate time and package sizes to deanonymize the user.
- Abuse: the same technology that protects activists can also be used for illegal activities, which has led to some stigmatization and partial blockages by some Internet providers.
Best practices for safe sailing with Tor
- Do not install external plugins or plugins: you can filter information and break anonymity.
- Prefer HTTPS sites: ensures that the communication between the output node and the site is encrypted from end to end.
- Maintain default window size: avoid maximizing or redimensioning the window, as this can be used for fingerprinting.
- Download with caution: downloaded files may contain malware that, when opened out of Tor, reveals your real IP.
- Keep the browser up to date: the Tor project frequently publishes security patches that correct known vulnerabilities.
- Consider using a trusted VPN before connecting to Tor only if you need to hide the fact of using Tor to your ISP, but remember that this adds another confidence point.
- Avoid logging into personal accounts (mail, social media) while using Tor, as it would link your real identity to the anonymous session.
Conclusion
Tor Browser represents one of the most accessible and effective tools to protect online privacy, offering a balance between usability and solid security. Although it is not a magic solution and has certain specific speed and risk limitations, its correct configuration and follow-up of good practices allow journalists, activists, researchers and any citizen concerned about their data to navigate with a level of anonymity difficult to achieve through other media. In a world where monitoring and data collection are increasingly omnipresent, understanding and responsibly using Tor Browser becomes a valuable ability to preserve freedom of expression and the right to privacy.
