Whonix is a free desktop operating system (OS) that is specifically designed for advanced security and privacy. Based on Tor, Debian GNU/Linux and the principle of security by isolation, it realistically addresses common attack vectors while maintaining usability. Online anonymity is made possible via fail-safe, automatic, and desktop-wide use of the Tor network, meaning all connections are forced through Tor or blocked. The Tor network helps to protect from traffic analysis by bouncing your communications around a distributed network of relays run by global volunteers. Without advanced, end-to-end, netflow correlation attacks, anybody watching your Internet connection cannot easily determine the sites you visit, and those sites cannot learn your physical location. 
Whonix uses a heavily reconfigured Debian base which is run inside multiple virtual machines (VMs) on top of the host OS. This architecture provides a substantial layer of protection from malware and IP leaks. Applications are pre-installed and pre-configured with safe defaults to make them ready for use. The user is not jeopardized by installing custom applications or personalizing the desktop. Whonix is the only actively developed OS designed to be run inside a VM and paired with Tor.
Whonix consists of two parts: the Whonix-Gateway and the Whonix-Workstation. The former runs Tor processes and acts as a gateway, while the latter runs user applications on a completely isolated network. The Whonix design affords several benefits:
- Only connections through Tor are permitted.
- Servers can be run, and applications used, anonymously over the internet.
- DNS leaks are impossible.
- Malware with root privileges cannot discover the user's real IP address.
- Threats posed by misbehaving applications and user error are minimized.
Many pre-installed or custom-installed applications used simultaneously are stream-isolated in Whonix. For example, Tor Browser, Hexchat, Thunderbird and several other applications use a dedicated Tor SocksPort, preventing identity (pseudonym) correlation that may otherwise occur when the same Tor circuit and exit relay are used. Applications using Tor's DNS and/or Transport can be optionally disabled.
Whonix User Groups
The increasing threat of mass surveillance and repression all over the world means our freedoms and privacy are rapidly being eroded. Without precautions, your Internet service provider (ISP), the State, the police and global surveillance systems can record everything you do online, as IP addresses associated with network activity are easily traced to the physical location of your computer(s), and ultimately you. Whonix is one solution to this problem.
Anyone who values privacy or does sensitive work on their desktop or online can benefit from using Whonix. This includes, but is not limited to:
- Investigators and whistleblowers whose work threatens the powerful.
- Within an isolated environment, research and evidence can be gathered without accidental exposure.
- Researchers, government officials, or business-people who may be targets of espionage.
- Anti-malware and anti-exploit modifications lower the threat of trojans and backdoors.
- Journalists who endanger themselves and their families by reporting on organized crime.
- Compartmentalized, anonymous internet use prevents identity correlation between social media and other logins.
- Political activists under targeted surveillance and attack.
- The usefulness of threatening the ISP in order to analyze a target's internet use will be severely limited. The cost of targeting a Whonix user is greatly increased.
- Average computer users in a repressive or censored environment.
- Easy Tor setup and options for advanced configurations means users in repressive countries can fully access the internet desktop-wide, not just in their browser.
- Average computer users who simply don’t want all or some aspect of their private lives uploaded, saved, and analyzed.
- Whonix does not silently upload identifying information in the background.
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- Current practical, low-latency, anonymity designs like Tor fail when the attacker can see both ends of the communication channel (traffic going into and out of the Tor network). If you can see both flows, simple statistics can determine whether they match up.