CLOCK PERIOD RANDOMIZATION FOR PROTECTION AGAINST CRYPTOGRAPHIC ATTACKS

摘要

To provide a method, a system, and a device that protect against cryptographic attacks.SOLUTION: A device integrated into a high-level system 300 provides a secure operation including a cryptographic operation such as an encrypted communication. The device is driven by an input clock 360 to provide the operation. The system randomizes device clock speed to protect against cryptographic attacks. A clock period randomizer 350 includes a fixed delay generator and a variable delay generator. A variable delay 320 generated by the variable delay generator is based on random or pseudo-random values that change from time to time or periodically. A variable clock 365 which is an output of the clock period randomizer 350 is provided to the device.EFFECT: A side-channel attack and a fault injection attack are made more difficult by using a clock with a variable period during the cryptographic operation.SELECTED DRAWING: Figure 3