This disclosure relates to a system and related operating methods. A computer-implemented server device receives a request from a device that includes an identifier proposed for a potential account holder. The computer-implemented server device determines whether the identifier is available for use with a new account, and communicates a response to the device that indicates whether the identifier is available for use with the new account. The response is presented at the device and includes an image that contains a visually obfuscated representation of an alphanumeric message that indicates either a success or a failure.