Downloaded the file for Win7, also Gpg4Win. Mentioned .asc file did not accompany Tor, in spite of the description on the Torsite. Other ways of verification I could not find. Nevertheless I followed the description involving Gpg4Win under "How to verify signatures for packages" via cmd.exe, it did not work.
How can I verify Tor Browser?
PS:Gpg seems not to be in English available?
Go to the Tor Browser Bundle download page. Select the correct download, and download! Below the nice, purple button should be a link that says sig. Don't left click but instead right click it. Then select Save Link As in the context menu. (In Firefox, I don't know in the rest, sorry. In Safari I believe you Alt click the link.)
Once downloaded verify as normal. From Tor Project Docs (It contains instructions for Mac and Linux as well.)
You need to have GnuPG installed before you can verify signatures. Download it from http://gpg4win.org/download.html.
Once it's installed, use GnuPG to import the key that signed your package. Since GnuPG for Windows is a command-line tool, you will need to use cmd.exe. Unless you edit your PATH environment variable, you will need to tell Windows the full path to the GnuPG program. If you installed GnuPG with the default values, the path should be something like this: C:\Program Files\Gnu\GnuPg\gpg.exe.
Erinn Clark signs the Tor Browser Bundles. Import her key (0x416F061063FEE659) by starting cmd.exe and typing:
"C:\Program Files\Gnu\GnuPg\gpg.exe" --keyserver x-hkp://pool.sks-keyservers.net --recv-keys 0x416F061063FEE659
After importing the key, you can verify that the fingerprint is correct:
"C:\Program Files\Gnu\GnuPg\gpg.exe" --fingerprint 0x416F061063FEE659
You should see:
pub 2048R/63FEE659 2003-10-16 Key fingerprint = 8738 A680 B84B 3031 A630 F2DB 416F 0610 63FE E659 uid Erinn Clark <[email protected]> uid Erinn Clark <[email protected]> uid Erinn Clark <[email protected]> sub 2048R/EB399FD7 2003-10-16To verify the signature of the package you downloaded, you will need to download the ".asc" file as well. Assuming you downloaded the package and its signature to your Desktop, run:
"C:\Program Files\Gnu\GnuPg\gpg.exe" --verify C:\Users\Alice\Desktop\tor-browser-2.3.25-13_en-US.exe.asc C:\Users\Alice\Desktop\tor-browser-2.3.25-13_en-US.exe
The output should say "Good signature":
gpg: Signature made Wed 31 Aug 2011 06:37:01 PM EDT using RSA key ID 63FEE659 gpg: Good signature from "Erinn Clark <[email protected]>" gpg: aka "Erinn Clark <[email protected]>" gpg: aka "Erinn Clark <[email protected]>" gpg: WARNING: This key is not certified with a trusted signature! gpg: There is no indication that the signature belongs to the owner. Primary key fingerprint: 8738 A680 B84B 3031 A630 F2DB 416F 0610 63FE E659Notice that there is a warning because you haven't assigned a trust index to this person. This means that GnuPG verified that the key made that signature, but it's up to you to decide if that key really belongs to the developer. The best method is to meet the developer in person and exchange key fingerprints.
Then install as normal by running the .exe, should be torbrowser-install-X.Y.Z_LANGUAGE.exe in my case torbrowser-install-3.6.2_en-US.exe. Tor Project has instructions in greater detail for Windows, Linux, and Mac.
You have to download the .asc file yourself. Click the "(sig)" part under the purple download button, left of the language selector: https://www.torproject.org/download/download-easy.html.en
EDIT: I had problems with using the full path to GnuPG as well, go to the folder first:
cd C:\Program Files (x86)\Gnu\GnuPg
(This is for 64 bit windows, for 32 bit windows; remove the (x86) After that you just type gpg.exe with the commands you want to use, e.g.:
gpg.exe --keyserver x-hkp://pool.sks-keyservers.net --recv-keys 0x416F061063FEE659
