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All e-commerce environments require support for security properties such as authentication, authorization, data confidentiality, and non-repudiation. E-commerce protocols such as SSL, TLS, and SET offer security for e-transactions, but they are specific to the unicast (point-to-point) environment. They cannot be directly extended to provide security for multicast (point-to-multipoint) sessions. Multicast data transmission provides significant network resource savings for applications such as audio/video streaming, news broadcast services and software distribution. However, security is required to prevent theft, and to ensure revenue generation from authorized recipients.
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