gchq cyberchef magic decoder #base64 #jwtdecode gchq cyberchef magic decoder #base64 #jwtdecode https://github.com/gchq/ https://github.com/gchq/CyberChef https://gchq.github.io/CyberChef/#recipe=Magic(3,false,false,'')&input=V1Vh https://github.com/gchq/CyberChef/wiki/Automatic-detection-of-encoded-data-using-CyberChef-Magic