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In this paper, we provide a low cost AES core for ZigBee devices which accelerates the computation of AES algorithms. Also, by embedding the AES core, we present an efficient architecture of security accelerator satisfying the IEEE 802.15.4 specifications. In our experiments, we observed that the AES core and the security accelerator use fewer logic gates(More)
For high data rate, new MAC mechanisms such as Block Ack in IEEE 802.11e and frame aggregation in IEEE 802.11n are being currently discussed and these mechanisms need short response time in each MPDU processing. In this paper, we propose a design of cipher engine for IEEE 802.11i to support these new mechanisms. We reduce the processing overhead of RC4 key(More)
Digitalization of various kinds of information is accelerating the convergence between them by fast development of network technology. Service provision also has been advanced because the convergence of information is becoming easy. And there are many researches to realize context-aware services that recognize users and devices environments based on(More)
INTRODUCTION Mobile phone technologies have been promoted to improve adherence to antiretroviral therapy (ART). We studied the receptiveness of patients in a rural Ugandan setting to the use of short messaging service (SMS) communication for such purposes. METHODS We performed a cross-sectional analysis measuring mobile phone ownership and literacy(More)