To install GPG on your Debian/Ubuntu/Mint Linux operating system use command:
sudo apt install gpg
Simple encrypt command with password:
gpg -c [FileName.txt]
Simple decrypt encrypted file with gpg:
gpg -o [FileName.txt] -d [FileName.txt.gpg]
This command decrypt enctypted file FileName.txt.gpg into normal file FileName.txt
Encryption using a key pair (asymmetric encryption):
Default GPG folder is: /home/user/.gnupg. Generate private and public keys:
gpg --full-generate-key
Answer the several questions (encryption type: RSA, keysize: 4096 for better encryption, key expiration time, your name and email address) and press “O” if all changes are correct.
To view public keys use command:
gpg -k
To view secret gpg keys use command:
gpg -K