Even after selecting the above checkboxes it asked for passphrase once. I work on the receiving end, and I already have the decryption part working by entering a passphrase. So far so good. I also have the private key used for decryption in the key ring. I am able to run the command line and get the passphrase prompt. Type it into the dialog, which may look different for Enigmail users, then hit the “Enter” key. Question: How it works? But immediately after that, it decrypted without prompting for a passphrase. gpg --batch --passphrase-fd 0 --output "myoutput" --decrypt "myencryptedfilename" < echo mypassphrase Note: the batch option is required to not have the UI prompt come up. I run gpg -c file.It asks for a password (twice) and creates an encrypted file. But with the echo command it can be done on a commandline too on fd 0: echo password | gpg --passphrase-fd 0 --decrypt / --encrypt. your key without a passphrase. gpg decrypt without using passphrase. You will now be prompted to enter your GPG passphrase. These notes are based on Windows 10 with Gpg4win. The intention here is that 'n' is a file-descriptor number that you use to pipe the passphrase to gpg. Answer: On a high-level it works like this: First of all you need to create PGP key-pair; it’s called a key-pair because there is a pair of keys - private and public When file is encrypted (locked) with a Public key it’s considered safe (unauthorized people will not be able to unlock it and read the contents). needless to say, this "encryption" is totally worthless.. Without this option, I will be prompted on the >console. Once I input the passphrase all works well...so I know the command is just fine. Doesn't talk about the Windows gpg agent. Hi all, I'm working on this project, wherein a gpg-encrypted file is being generated and transmitted from one end and is being received and processed on another end. Thus, it can't be automatized. 7. If you are trying to decrypt a file or a bunch of files using batch file in windows you will write something like this: gpg --pinentry-mode=loopback --batch --yes --passphrase "abc%123" --decrypt-files *.pgp Gpg can create key pairs without passphrase, and it can also change the passphrase of an existing key pair. No, you'll have to pipe it through a file descriptor with --passphrase-fd. 6. gpg remove passphrase, Let me share what I found. I thought I might share in case there is another lost soul In the bash shell, gpg2 --batch --gen-key < seems to work fine for removing a passphrase. When I run gpg file.gpg to decrypt the file it decrypts it without asking for the password ! The goal is now to remove the existing passphrase from the key pair, making it into a passphrase-less, unprotected one. To automatize the gpg signing, I have to remove the passphrase from the key pair. 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