Why cant i use this code to use digital signature on my file? <pre><code>$lol = system("sudo gpg --clearsign asd.txt;"); </code></pre> <p>Is it because I need the password for the gpg?? </p> <p>sudoers:</p> <p>root ALL=(ALL) NOPASSWD:ALL</p> <p>apache ALL=(ALL) NOPASSWD:ALL</p> <p>www-data ALL=(ALL) NOPASSWD:ALL</p>