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E-commerce is the utilization of computer technology to accept payments and fulfill delivery of products and services via the Internet or private networks.
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The explosive growth of online transactions push some companies into becoming CSP (Commerce Service Providers):OneHost, AT&T, etc.
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Characteristics:
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transport over insecure public networks
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confidentiality: based upon cryptographic protocols
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authentication and trust: based on digital certificates and signatures
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fundamental unit: financial transaction
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