An encryption card includes a processing unit, a storage unit, a connection interface drive and a connection interface for encryption card. A method of its application used in mobile terminal is to connect encryption card connection interface with mobile terminal as well as storing unit and connection interface drive to be connected with the processing unit through two-way bus. The present invention only adds encryption card connection interface on the existing mobile terminal, then encryption card in different encryption method can be set up and supported with encryption and connection interface to connect both for supporting specialized encryption service. It can make general mobile terminal extend to be an encryption terminal. |