In mobile devices, smart cards become the trend and are used in numerous applications and services. Since mobile devices are battery-powered, so it is important to find energy saving solutions to reduce energy consumption. Most mobile devices are powered by batteries with limited power capacity. In order to protect information during the communication process, security system designers use many cryptographic algorithms to protect user data. The encryption technology will consume considerable power. The Cryptographic algorithms are implemented on a security chip that is embedded in a smart card. When the CPU clock changes the execution time and the energy consumption will thus change. In this paper LabView2010 and related hardware are used to build a power measurement environment. Two sets of experiments are conducted i. e. in fixed clock experiment, which shows that the algorithm complexity affect the power saving and increase execution time, mean while reducing the clock rate has more impact to the execution time than the energy consumption. Second one in random clock experiment, which is used to focus energy consumption distribution of different key.

Cryptographic LabView Smart card CPU clock Energy consumption