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). 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). You should now see the contents of the message in the Command Prompt window. Question: How it works? I checked the existing post link below, but that explains only for Linux. your key without a passphrase. Even after selecting the above checkboxes it asked for passphrase once. Your key is encrypted when stored on disk so that an attacker getting hold of the file doesn't yet have your key. You will now be prompted to enter your GPG passphrase. I work on the receiving end, and I already have the decryption part working by entering a passphrase. I run gpg -c file.It asks for a password (twice) and creates an encrypted file. 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. 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. These notes are based on Windows 10 with Gpg4win. 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. 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. So far so good. But with the echo command it can be done on a commandline too on fd 0: echo password | gpg --passphrase-fd 0 --decrypt / --encrypt. To automatize the gpg signing, I have to remove the passphrase from the key pair. But immediately after that, it decrypted without prompting for a passphrase. 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 without passphrase. The intention here is that 'n' is a file-descriptor number that you use to pipe the passphrase to gpg. Once I input the passphrase all works well...so I know the command is just fine. 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. >encryption or decryption? 6. The goal is now to remove the existing passphrase from the key pair, making it into a passphrase-less, unprotected one. gpg decrypt without using passphrase. Thus, it can't be automatized. I am able to run the command line and get the passphrase prompt. gpg remove passphrase, Let me share what I found. I have the newest version of GPG for windows installed on the machine. Without this option, I will be prompted on the >console. needless to say, this "encryption" is totally worthless.. I also have the private key used for decryption in the key ring. Type it into the dialog, which may look different for Enigmail users, then hit the “Enter” key. 7. When I run gpg file.gpg to decrypt the file it decrypts it without asking for the password ! Version of gpg for Windows installed on the receiving end, and can. File descriptor with -- passphrase-fd gpg can create key pairs without passphrase, and it can also the! 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