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PDAs and smartphones are increasingly being used as handheld computers. Today, their network connectivity and their usages for various tasks over the Internet require privacy and authenticity. This paper conducts a comprehensive and comparative study of the performance of the SSL protocol for PDA and laptop clients, both in WEP secured and opens Wi-Fi environments. Unlike previous studies,, the measurements are at sub-protocol granularity allowing for researchers to consider appropriate optimizations for these resource-constrained devices. Unsurprisingly, the paper finds that SSL handshake costs 3 times more at a PDA client than it does for a laptop client, but surprisingly most of the delay comes from network latency and other PDA architecture issues, not cryptographic computation.
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