Further, the Tor client establishes an ephemeral encryption key with each relay in the circuit; these extra layers of encryption mean that only the exit relay can read the cells. Authentication : Every Tor relay has a public decryption key called the "onion key".
Each relay rotates its onion key once a week. When the Tor client establishes circuits, at each step it demands that the Tor relay prove knowledge of its onion key. Coordination : How do clients know what the relays are, and how do they know that they have the right keys for them? Each relay has a long-term public signing key called the "identity key".
Each directory authority additionally has a "directory signing key". The directory authorities provide a signed list of all the known relays, and in that list are a set of certificates from each relay self-signed by their identity key specifying their keys, locations, exit policies, and so on. The Tor software comes with a built-in list of location and public key for each directory authority. So the only way to trick users into using a fake Tor network is to give them a specially modified version of the software.
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Below we explain why it is important and how to verify that the Tor Browser you download is the one we have created and has not been modified by some attacker. Each file on our download page is accompanied by a file labelled "signature" with the same name as the package and the extension ". This will vary by web browser, but generally you can download this file by right-clicking the "signature" link and selecting the "save file as" option.
For example, torbrowser-install-win These are example file names and will not exactly match the file names that you download. Please notice that a signature is dated the moment the package has been signed. Therefore every time a new file is uploaded a new signature is generated with a different date.
As long as you have verified the signature you should not worry that the reported date may vary. If you run Windows, download Gpg4win and run its installer. In order to verify the signature you will need to type a few commands in windows command-line, cmd. In order to verify the signature you will need to type a few commands in the Terminal under "Applications". In order to verify the signature you will need to type a few commands in a terminal window.
How to do this will vary depending on your distribution. The Tor Browser team signs Tor Browser releases. You might be able to import the key using the Workaround using a public key section instead. This command results in the key being saved to a file found at the path.
To verify the signature of the package you downloaded, you will need to download the corresponding ". The examples below assume that you downloaded these two files to your "Downloads" folder. Note that these commands use example file names and yours will be different: you will have downloaded a different version than 9. Active Oldest Votes. Improve this answer. Joseph Bisch Joseph Bisch 11 1 1 bronze badge.
The download worked. The keys are correct. What else can I do? How am I supposed to get the correct signature from the developers other than via the download link on the instruction page? Hey, developers! Wanna meet me and exchange the key fingerprints? It may be enough to have done what you did. Only you can say what you are comfortable with. And as I said, it may just not be practicable for you to exchange key fingerprints in person.
OK, I understand. But if the keys match the keys on the download page at least I could trust that those that wrote the keys on the download page also wrote the program, is that correct? But you are right that you add something a signature if you know the key belongs to the developer. You are supposed to verify identity in person. And if the keys match the keys on the download page, then it indicates the key owner approved the program, not necessarily wrote it, though usually it means both.
And there is the potential that a certificate authority can issue a fake SSL certificate for torproject. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password.
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