Patent ID: 7404523
Filing Date: 2008-07-29
Classification: H04L

Abstract:
1. An IC card comprising: a communication module which performs data communication with an external device; a memory which stores first and second programs, the first program having a data storing function and an encryption/decryption function and including a first cipher key, and the second program having a data conversion function and an encryption/decryption function and including the first cipher key and a second cipher key; and an operating module which executes the first and second programs, wherein the second program operates to receive encrypted data input via the communication module, decrypt the received data using the second cipher key, encrypt the decrypted data using the first cipher key and pass the encrypted data to the first program, wherein the first program operates to receive the encrypted data from the second program, and decrypt the encrypted data using the first cipher key to store the decrypted data in the memory.