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Brooke Singh
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Asked: 2022-05-18T17:02:04+00:00 In:

The best way to fix the gpg can’t check signature no public key error.

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For the problem “gpg can’t check signature no public key”. I tried to fix it, but it doesn’t work and returns the result I want. Here is my program:

gpg --output file.txt --decrypt file.pgp

and

"gpg: Can't check signature: public key not found"

has occurred. I’ve checked the entire command line but still can’t find the mistake.

check signature no public key
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2 Answers

  1. Best Answer
    Expert

    The cause:

    After looking over your program, I find that you don’t possess the public key for the person who signed your message, so the error happens.

    Solution:

    You should have received a message with the ID of what key was used to sign the file from gpg. Then, you get the public key from the person that encrypted the file. Next, you have inputed it into gpg2 --import key.asc, you will be able verify the signature.

    If a keyserver (for example, https://pgp.mit.edu/) receives public key from the sender, you will be able to input the key directly from the keyserver:

    gpg2 --keyserver https://pgp.mit.edu/ --search-keys <sender_name_or_address>
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  2. The public key for your gpg keyring is required. You can import the public keys into your public keyring by placing the public key block in a text document with a.gpg extension and then issuing the following command: 

    gpg --import <your-file>.gpg

    This block should be provided by the entity that encrypted your file. For example, ftp://ftp.gnu.org/gnu/gnu-keyring.gpg has the block for gnu.org.

    Verifying files without a.sig or.asc to verify their authenticity.

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