Cannot Decrypt Message in PGP
I am currently supporting a client and as per probing, this was the error message encountered: Message/File was encrypted to the following public key(s): Usernamefirstname.lastname@example.org (KeyType/Size) OR X Unknown Key(s) It is not possible to decrypt this message because your keyring does not contain usable private key(s) corresponding to any of the above public key(s
Now, i have tried searching for solutions in Enterprise Support and below is what i have found:
1. If your key's icon is just a single key, or you cannot locate your key at all, then PGP Desktop does not have your keypair. In this case, you should consider the following common scenarios and refer to the appropriate knowledge base answer(s) for more assistance:
- You attempted to transfer your keypair from another computer, but you only exported the public key. If you suspect that this might be the problem in your case, please refer to our frequently asked question: How Do I Export/Backup My Keypair?
- Your keypair exists on keyrings that have not been added to PGP Desktop yet (e.g. keyrings transferred from another computer). If you suspect that this might be the problem in your case, refer to our tutorial answer HOW TO: Add Existing Keyrings to PGP Desktop.
- You have deleted or lost your keypair, or the keyrings containing your keypair. If you suspect that this might be the problem in your case, please refer to the most appropriate answer(s) below.
- Since PGP Desktop automatically makes backups of your keyrings, you should try accessing the backup keyrings by referring to our tutorial answer HOW TO: Access the Backup Keyrings Created Automatically by PGP Desktop.
- If you have a backup copy of your keypair, refer to the answer HOW TO: Import a Keypair into PGP Desktop.
- If your PGP Desktop is managed by a PGP Universal Server and you have already sent five reconstruction questions and answers to the server, refer to the answer HOW TO: Reconstruct Your Private Key.
The issue here is that the file was encrypted in a different country using the client's public key (old), however, the private key on client's laptop seem to have been deleted. Now, client went back to his home country and was trying to decrypt the file sent to him then encountered the error above. On item three (you have deleted or lost your keypair...), backup on client's laptop does not have the keypair for that public key (old). I have created a new key (adminkey) on his PGP desktop and signed all existing keys (for verification). Is there a way for the encrypted file to be opened using the newly signed public key (old signed by adminkey) without having to send the public key to the one encrypting the file and ask them to send the file back to the client? (It's a bit of hassle for the client because of the large number of encrypted files already containing the previous public key).
Appreciate your help. Thank you!