Abstract: An application creating apparatus generates first authentication information using an authentication element is provided. The apparatus includes an application module when the application module is created, inserts the first authentication information into the application module, and distributes the application module. A user digital device that executes the application module checks the authentication element and the first authentication information included in the application module, generates second authentication information for the authentication element, and determines whether to execute the application module based on a result of comparison between the first authentication information and the second authentication information.

Abstract: An application creating apparatus generates first authentication information using an authentication element is provided. The apparatus includes an application module when the application module is created, inserts the first authentication information into the application module, and distributes the application module. A user digital device that executes the application module checks the authentication element and the first authentication information included in the application module, generates second authentication information for the authentication element, and determines whether to execute the application module based on a result of comparison between the first authentication information and the second authentication information.

Abstract: A method and apparatus for protecting an application in a user digital device are provided. The method includes downloading an application module and installing an application; receiving an execution request for the application; extracting authentication information from the application module, extracting an authentication element included in the application from the application, generating an authentication signature using the authentication element; comparing a reference authentication signature included in the authentication information with the generated authentication signature; and if the reference authentication signature is identical to the generated authentication signature, normally executing the application.