Hidden Service, as are many dark web sites.The Electronic Frontier Foundation's Surveillance Self-Defense project has a lovely writeup describing how Tor works, which is well worth the time to read if you're going to use it.If the opposition has compromised the software on your local machine, through exploiting an unpatched vulnerability in the operating system or tricking the user in to opening a poisoned file that exploits an application-level bug, you have a very real problem. Your data is in plaintext on your computer, and if the opposition are in there too, they can just take it at the source. The ultimate back-stop against this is to boot in to a read-only environment which doesn't allow itself to be modified except in very limited ways.
The preferred solution is a Linux live distribution called TAILS (The Amnesiac Incognito Linux System); Amnesiac because by default it won't remember anything about you between sessions or leave any trace on the host PC. “Incognito” because it comes pre-configured for Tor and has a strong focus on preserving your anonymity.The OpenOffice suite is included to allow for general productivity, along with a GPG-ready email client, the Pidgin IM client with OTR plugin pre-installed (both configured to run via Tor straight away). There is an insecure web browser available in case you need to get through a browser-based Wi-Fi login, but otherwise you will be going via Tor for everything.Don't run TAILS inside a virtual machine. If your real machine is compromised, all your keystrokes would be at risk before they get into the VM – and the RAM of the VM could also potentially be breached from the outside. You need to boot a real machine in to it; to be properly safe, an un-sexy laptop from a few years ago should fit the bill nicely. It will certainly detect VirtualBox and complain accordingly.
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