Abstract: Disclosed are an IC chip for preventing identification key leak and an authorization method thereof. An IC chip capable of performing a financial function includes: a PIN supply unit for supplying a PIN used for authorization when performing a financial function using the IC chip; and a blocking unit for physically blocking the gap between the PIN supply unit and an input-output interface when the PIN is supplied to the outside through the input-output interface at an initial access of the IC chip.

Abstract: Provided are a security device and a method for operating same. The security device may conceal an encryption key used for an encryption algorithm in an encryption module in correspondence to security attacks such as reading information on where the encryption key is stored in a memory by disassembling an IC chip, or extracting said information through microprobing. The encryption key may be included as a physical encryption key module in an encryption module, and a certain storage medium for storing the encryption key may be included in the encryption module. Accordingly, the encryption key is not transmitted via a bus in a security device for encryption.

Abstract: Provided is a security communication method of a terminal device. A first authentication unit of the terminal device identifies a first subscriber to connect a first communication network. A second authentication unit of the terminal device exclusively operates with the first authentication unit, and identifies a second subscriber to connect a second communication network which is different from the first communication network. When the second subscriber is identified, at least one external communication module of the terminal device can be inactive.