Abstract: An authorization method and a simple key agreement protocol based on both sides' IDs of participants are proposed to meet the requirements for secure storage and secure access of smart TV payment. Combined with symmetric encryption algorithms, the data transmission and data access protections between smart TV and security storage chip are realized and the scale and complexion of the security storage chip are reduced also. The result shows that the chip gate complexity has been reduced to about 1/6 of ECC and 1/4 of RSA with the same encryption strength.