gistfile1.txt

message="message.txt"
encrypted_msg="message.gpg"
receiver_pub_key="receiver_key.pub"
receiver_email="[email protected]"

# 1. Receiver - Create public key.
gpg --gen-key

# 2. Receiver - Export public key and share it with the Sender
gpg --armor --output "$receiver_pub_key" --export "$receiver_email"

# 3. Sender - import gpg key from receiver.
gpg --import "$receiver_pub_key"

# 4. Sender - Encrypt message to be sent. 
gpg --output "$encrypted_msg" --encrypt --recipient "$receiver_email"  "$message"

# 5. Sender - Send encrypted message to the receiver. 

# 6. Receiver - Decrypt the message.
gpg --output message --decrypt "$encrypted_msg"