Mobile app

$email = trim( "MyEmailAddress@example.com " ); // "MyEmailAddress@example.com"
$email = strtolower( $email ); // "myemailaddress@example.com"
echo md5( $email );
// "0bc83cb571cd1c50ba6f3e8a78ef1346"

Source: en.gravatar.com

Mobile app

% gpg --import KEYS
% gpg --verify downloaded_file.asc downloaded_file

Source: apache.org

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