Onionshare logo linux5/3/2023 ![]() ![]() The Tor address is a string of characters assigned to you by Tor (as shown in Figure 2). The history shows how often and when a file was downloaded – but not by whom. (For a CLI variant, see the "OnionShare as a Service" box.)įigure 2: Send the OnionShare address to your contact. If you can't find a suitable package for your distribution, see the instructions online for tips on building the current version from scratch. On Arch Linux, you will find OnionShare in the AUR of the same name. On the homepage, however, the developers point users to an Ubuntu PPA that supports the installation of the latest version with just a few commands ( Listing 1). Even the brand-new Ubuntu 19.04 "Disco Dingo" runs version 1.3.2 of the program. Version 2.0 of OnionShare was released earlier this year and is not yet available in the package sources of the major distributions. Even users who are not interested in long-term participation in the Tor community have learned that OnionShare can be an easy and secure way to post a file without the need for commercial cloud services. Less well known is OnionShare, a useful tool that lets you anonymously share files on Tor networks. The Tor Browser is a standard tool at this point that is well known to many Linux users, and tutorials on how to use Tor have appeared in many forms – including in this magazine. Hidden services can also be used to exchange files without participants having to reveal IP addresses, domain names, or account details. Although anonymous routing allows criminal machinations on the one hand, on the other, it genuinely helps people to protect their privacy. Like so many things, hidden services have two sides. Tor comes with the Onion Service Protocol and the hidden services that help users not only use, but also to provide, services anonymously. As an alternative, the developers are also working on Tails, a live distribution that offers an inherently secure platform. ![]() For this reason, the project offers the preconfigured Tor Browser with an integrated Tor client for all common operating systems. You also have to harden the browser and preferably the whole system. ![]() To really protect your privacy, you need to do more than simply route your traffic through Tor. One of the points of criticism lies in the inexperience of the users. The onion routing process is considered relatively secure, although various attack scenarios are known. (For more information, see the "How Private?" box.) This technique is known as onion routing, because the many layers of encrypted routing information resemble the layers of an onion that are gradually peeled away as the packet makes its way through the network. Each router can only read the single layer specifically encrypted and addressed to it. The power of onion routing is that no single router on the network has complete knowledge of where the packet came from and where it is going. Each router receives the packet and uses its private key to decrypt the outermost layer, which contains a destination address for where to forward the packet, and then sends the data on to the next link in the chain. The packet is encapsulated in multiple layers of encrypted routing information. A data packet takes a random path through a series of the routers. Onion routing routes a message through a message of participating routers that could be anywhere on the Internet. The core technology behind the Tor Browser is a technique known as onion routing. The project's Tor Browser, which lets the user surf the web without leaving a trail or trace, was originally intended to help dissidents in totalitarian countries communicate without surveillance, but since then, it has become popular with whistle-blowers, drug buyers, and millions of everyday users who simply don't want to submit to the culture of tracking and targeting that exists on the mainstream Internet. The Tor Project has spawned a whole global community dedicated to the concept of anonymous browsing.
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