Patent ID: 8341758

Claim:
A secure device, comprising: a secure module configured to convert plaintext data received from an outside into ciphertext data and store the converted ciphertext data, and further configured to convert stored ciphertext data into plaintext data and output the converted plaintext data; and a side channel attack sensing module comprising: a switch coupled between a power supply terminal and a charging node, and operating in response to the command execution enable signal; a capacitor coupled between the charging node and a ground, and accumulating charges transferred from the power supply terminal according to an operation of the switch; and a side channel attack sensing unit sensing a voltage between the charging node and the ground and determining that there is a side channel attack when the sensed voltage exceeds a predetermined voltage value, wherein if the side channel attack sensing unit determines there is a side channel attack, the side channel attack sensing module causes the secure module to stop operating, induces malfunctions of the secure module, delays operations of the secure module, or causes the secure module or a device including the secure module to be disabled.