Symmetric AES256 encryption and decryption with GPG

gpg-symmetric-example.sh

echo "Attack at dawn!" > secret-message-original.txt

echo "MyPassword" | gpg \
  --output secret-message.txt.gpg \
  --passphrase-fd 0 \
  --batch \
  --cipher-algo AES256 \
  --symmetric secret-message-original.txt

echo "MyPassword" | gpg \
  --output secret-message-decrypted.txt \
  --passphrase-fd 0 \
  --batch \
  --decrypt secret-message.txt.gpg

cat secret-message-original.txt | md5sum
cat secret-message-decrypted.txt | md5sum