**Attention: These instructions are to verify the tor source code.**
**Please follow the right instructions to verify [Tor Browser's signature?](tbb/how-to-verify-signature/).**
**Please follow the right instructions to verify [Tor Browser's signature?](/tbb/how-to-verify-signature/).**
Digital signature is a process ensuring that a certain package was generated by its developers and has not been tampered with.
Below we explain why it is important and how to verify that the [tor source code](https://www.torproject.org/download/tor/) you download is the one we have created and has not been modified by some attacker.
Each file on our [download page](https://www.torproject.org/download/source) is accompanied by a file labelled "sig" with the same name as the package and the extension ".asc".
Each file on our [download page](https://www.torproject.org/download/tor) is accompanied by a file labelled "sig" with the same name as the package and the extension ".asc".
These .asc files are OpenPGP signatures.
They allow you to verify the file you've downloaded is exactly the one that we intended you to get.
This will vary by web browser, but generally you can download this file by right-clicking the "sig" link and selecting the "save file as" option.
No, Tor Browser is an open source software and it is free.
Any browser forcing you to pay and is claiming to be Tor Browser is fake.
To make sure you are downloading the right Tor Browser visit our [download page](https://www.torproject.org/download/).
After downloading, you can make sure that you have the official version of Tor Browser by [verifying the signature](https://support.torproject.org/tbb/how-to-verify-signature/).
If you are not able to access our website, then visit [censorship section](https://support.torproject.org/censorship/censorship-3/) to get information about alternate way of downloading Tor Browser.
After downloading, you can make sure that you have the official version of Tor Browser by [verifying the signature](/tbb/how-to-verify-signature/).
If you are not able to access our website, then visit [censorship section](/censorship/gettor-1) to get information about alternate way of downloading Tor Browser.
You can report fake Tor Browsers on frontdesk@torproject.org
