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    Packet filtering circuits for smart phones
    (2012-12-01)
    Sato, Tomoaki
    ;
    Moungnoul, Phichet
    ;
    Fukase, Masa Aki
    Security measures for smart phones are important. Anti-virus software for smart phones can be used and the process consumes CPU resources. The CPUs of them are powerless CPU for an embedded system and those operations consume battery power. In this paper, the authors propose packet filtering circuits for smart phones. The packet filtering circuits are a firewall. Using the firewall is a means to protect smart phones from computer viruses and unauthorized access. In addition, they are used to control the power consumption and to reduce of detecting units for unauthorized access. The features of the circuits are to achieve those functions without reconstructing circuits. The operations of the circuits are verified by gate-level simulations.
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    Delay time analysis of reconfigurable firewall unit
    (2011-12-01)
    Sato, Tomoaki
    ;
    Moungnoul, Phichet
    ;
    Fukase, Masa Aki
    A firewall function is indispensable for mobile devices and it demands low-power operations. To realize this demand, the authors have developed a firewall unit with a reconfigurable device. The firewall unit needs a large amount of register for the timing adjustment of packets. Using the registers is the cause of power consumption. In this paper, to solve the problem of power consumption, the firewall unit has developed by using wave-pipelining technique and detailed delay time for the technique is analyzed.
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    Compatible WEP algorithm for improved cipher strength and high-speed processing
    (2011-08-12)
    Sato, Tomoaki
    ;
    Moungnoul, Phichet
    ;
    Fukase, Masa Aki
    As a cipher algorithm of Wi-Fi (Wireless Fidelity) networks based on IEEE 802.11b/g/h standards, WEP (Wired Equivalent Privacy) is widely used and can correspond to most Wi-Fi devices. However, the method of deciphering WEP has already been clarified and it is executed in several seconds. Nevertheless, a lot of Wi-Fi APs (Access Points) use it because a part of equipment has only WEP in the cipher function. Additionally, some mobile processors demand algorithm a cipher of low load. In this paper, the authors propose a compatible WEP algorithm to which cipher strength is strengthened. The algorithm is implemented with software and evaluated. As a result, it is shown that processing speed of the compatible WEP algorithm is more high-speed than that of the conventional WEP algorithm. © 2011 IEEE.
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    Development of a WiMAX processor by using a CPLD
    (2010-12-01)
    Sato, Tomoaki
    ;
    Moungnoul, Phichet
    ;
    Fukase, Masa Aki
    WiMAX (Worldwide Interoperability for Microwave Access) is one of the standards for high-speed wireless communications. The development cycle of a WiMAX processor is short because a transmission rate of a WiMAX system improves gradually. To keep using it even when the speed improves, there is a method of development that uses a processor that can be a reconfiguration of a circuits. In this paper, a mobile WiMAX processor by using a CPLD (Complex Programmable Logic Device) is proposed. Because wave-pipeline technique is used, the problem of processing speed is canceled. The authors evaluate wave-pipelined circuits which WiMAX processor needs on a CPLD. It is made clear that wave-pipeline technique is effective in the circuits on the CPLD.