Signing, Encryption, Decryption and Verification with GnuPG

1. Create a sample message file

# echo "Welcome to Utimaco" > message.txt 

2. Sign the file using the key name.

# gpg --output message.txt.signed --sign --default-key test@utimaco.com message.txt

Provide slot PIN when prompted. This will generate a signed file message.txt.signed

Signing the file

3. Verify the file message.txt.signed

# gpg --verify message.txt.signed 

Verifying the signed file

4. Encrypt the file. Provide recipient user ID when prompted

# gpg --output message.txt.enc --encrypt  message.txt 

Encrypting the file

This will generate an encrypted file message.txt.enc

5. Decrypt the encrypted file

# gpg --output message.txt.dec --decrypt  message.txt.enc 

Provide slot PIN when prompted. This will generate a decrypted file message.txt.dec

Decrypting the file

6. Verify the content of original file

# cat message.txt.dec 

Original content of the file