Is there a way to eliminate special characters when encrypting with GnuPG. I got the below issue.
When I encrypt some text with GPG it is including special characters like +.
Encrypt Command
--encrypt --armor --recipient
So when this encrypted text is passed via query string and when try to decrypt. I am getting the below error.
Error
gpg: no valid OpenPGP data found.gpg: decrypt_message failed: Unknown system error
So, Is there a way to configure GPG not to include some special characters?
No, there isn't. OpenPGP specifies two encodings, the ASCII armoring you use and the binary format.
ASCII armoring has originally been developed for mail transfer which only allows the basic, 7-bit ASCII characters without further encoding.
URL encoding requires additional limitations or encoding. If you cannot change the data (and with GnuPG/OpenPGP you can't), you'll have to add another encoding as enforced by the transfer protocol you chose.
Luckily, C# has such URL encoding and decoding methods built-in. I'd propose you also try URL-encoding the binary data if transmission size is critical, this might save a significant portion of data. If you only rarely transmit small encrypted messages, I'd stay with URL encoding the ASCII-armored message, as handling the ASCII-armored string data is generally more robust than exchanging binary information.