Hardware Trojan for ultra lightweight block cipher Piccolo

Recently, portable devices and wearable devices are widely used. The security is the most important problem for these devices. Usually, the confidential information in these devices is protected by encrypting data. These portable devices have area constraint. Therefore, AES, which is the most popular encryption standard, cannot be applied to these devices. Lightweight block ciphers require small area for their implementations. Therefore, lightweight block ciphers are used in portable devices. On the other hands, the threat of hardware Trojan against cipher circuit in electric devices has been pointed out. This study proposes a new hardware Trojan and examines to the characteristic of the proposed hardware Trojan by using a FPGA.