Encryption device and encryption operation method

A cryptographic operation method for performing a cryptographic operation by allocating a hardware module and software module to a secure application that requests the cryptographic operation, the method comprising:

• a determining step of determining an availability of the hardware module for a secure application that requests the cryptographic operation;
• a priority calculating step of calculating a priority of a cryptographic operation for the secure application that requests the cryptographic operation;
• a comparing step of, when the availability of the hardware module is not admitted, comparing priorities between the secure application that requests the cryptographic operation and another secure application from the secure application that requests the cryptographic operation and that is allocated to the hardware module;
• and
• an allocating step of, when a priority level of the secure application that requests the cryptographic operation is higher, releasing the another secure application from the hardware module, allocating the secure application that requests the cryptographic operation to the hardware module, and allocating the another secure application released to the software module.