But immediately after that, it decrypted without prompting for a passphrase. So far so good. needless to say, this "encryption" is totally worthless.. You should now see the contents of the message in the Command Prompt window. When I run gpg file.gpg to decrypt the file it decrypts it without asking for the password ! Gpg without passphrase. No, you'll have to pipe it through a file descriptor with --passphrase-fd. Gpg can create key pairs without passphrase, and it can also change the passphrase of an existing key pair. Even after selecting the above checkboxes it asked for passphrase once. 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). >encryption or decryption? Doesn't talk about the Windows gpg agent. your key without a passphrase. gpg decrypt without using passphrase. I work on the receiving end, and I already have the decryption part working by entering a passphrase. 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. Once I input the passphrase all works well...so I know the command is just fine. Without this option, I will be prompted on the >console. You will now be prompted to enter your GPG passphrase. These notes are based on Windows 10 with Gpg4win. I run gpg -c file.It asks for a password (twice) and creates an encrypted file. To automatize the gpg signing, I have to remove the passphrase from the key pair. Your key is encrypted when stored on disk so that an attacker getting hold of the file doesn't yet have your key. I have the newest version of GPG for windows installed on the machine. I am able to run the command line and get the passphrase prompt. 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. 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 also have the private key used for decryption in the key ring. The intention here is that 'n' is a file-descriptor number that you use to pipe the passphrase to gpg. 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. Type it into the dialog, which may look different for Enigmail users, then hit the “Enter” key. 6. The goal is now to remove the existing passphrase from the key pair, making it into a passphrase-less, unprotected one. 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 I checked the existing post link below, but that explains only for Linux. gpg remove passphrase, Let me share what I found. 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. Question: How it works? 7. Private key used for decryption in the key ring passphrase, and I have... Gpg file.gpg to decrypt the file it decrypts it without asking for the password passphrase-less, unprotected.! 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