I have the newest version of GPG for windows installed on the machine. But with the echo command it can be done on a commandline too on fd 0: echo password | gpg --passphrase-fd 0 --decrypt / --encrypt. 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 ! However, when you use gpg-preset-passphrase in a way that stores the passphrase argument plainly on disk as well, the attacker can simply read that file as well and decrypt your key. Gpg can create key pairs without passphrase, and it can also change the passphrase of an existing key pair. I checked the existing post link below, but that explains only for Linux. These notes are based on Windows 10 with Gpg4win. gpg decrypt without using passphrase. For example, you could do something like this in shell: cat passphrase-file | gpg --passphrase-fd 0 This would place the contents of the passphrase-file on gpg's stdin (fd=0). 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 am able to run the command line and get the passphrase prompt. 6. Question: How it works? Even after selecting the above checkboxes it asked for passphrase once. 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. needless to say, this "encryption" is totally worthless.. To automatize the gpg signing, I have to remove the passphrase from the key pair. gpg remove passphrase, Let me share what I found. The goal is now to remove the existing passphrase from the key pair, making it into a passphrase-less, unprotected one. 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). So far so good. I work on the receiving end, and I already have the decryption part working by entering a passphrase. Thus, it can't be automatized. I also have the private key used for decryption in the key ring. You should now see the contents of the message in the Command Prompt window. I run gpg -c file.It asks for a password (twice) and creates an encrypted file. 7. But immediately after that, it decrypted without prompting for a passphrase. Doesn't talk about the Windows gpg agent. No, you'll have to pipe it through a file descriptor with --passphrase-fd. Your key is encrypted when stored on disk so that an attacker getting hold of the file doesn't yet have your key. 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