How to Verify a GPG Signature
Part 1 of 2:
Downloading What You Need
To verify your belief that someone has signed a file, you will need a copy of that person's Public Key, a copy of the file, and a copy of the signature-file that was allegedly created through the interaction of the person's Secret Key and the file.
- Acquire the Public Key.
- Import the Public Key into GPG.
- Acquire a copy of the file in question.
- Save it in a Folder.
- Acquire a copy of the signature-file in question.
- Save it in the same Folder.
Part 2 of 2:
Using GPG to Verify that someone's Secret Key Signed the File in Question
GPG will help you verify the relationship between your three files.
- Open a command-line interface.
- Change the working directory to the Folder where your file and signature-file are saved.
- Verify the signature.
- Type the following command into a command-line interface:
gpg --verify [signature-file] [file]
- E.g., if you have acquired
- (1) the Public Key 0x416F061063FEE659,
- (2) the Tor Browser Bundle file (tor-browser.tar.gz), and
- (3) the signature-file posted alongside the Tor Browser Bundle file (tor-browser.tar.gz.asc),
- You would type the following:
gpg --verify tor-browser.tar.gz.asc tor-browser.tar.gz
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