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Processing of digital certificates on handsets during m-commerce slows response time. Passive data certificates as used in the Internet are not designed with speed of processing in mind, are not optimal for time or space, and are not scalable in the wireless environment in that modifications require changes to software in all handsets. This paper considers design options for certificates which will optimize processing and minimize response times for secure transactions and also allow for scalable upgrading of clients to handle new certificate formats which will arise. It recommends the representation of certificates as active data and software objects.
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