This paper presents Secure MultiMedia Mail System (SMMM), a secure multimedia electronic mail system that deals with issues related to security, network traffic reduction and storage management of multimedia messages. The composition of M/H (multimedia/hypermedia) messages in SMMM is based on NCM (Nested Context Model), a conceptual model for hypermedia documents. SMMM provides support for multimedia message exchange with security services that can be independently defined for messages and for their contents. SMMM is a platform independent mail system implemented in Java that uses widespread cryptographic mechanisms and is built on top of existing mail transport protocols for interoperability reasons.
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