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CryptoNET: Design and implementation of the Secure Email System

This paper describes the design and implementation of a secure, high assurance and very reliable Email system. The system handles standard Email security services - signing and encryption of Email letters and, in addition, provides a number of extended and innovative security features. These new features are: transparent handling of certificates, strong authentication between Secure Email client and Secure Email server, archiving and recovery of encrypted address books, simple and secure handling of cryptographic keys, security sessions management, tracking of Email letters using confirmation message, elimination of SPAM messages, prevention of fraudulent and infected attachments, and usage of smart cards. The system is structured in the form of security objects organized in the form of a large-scale security architecture based on proxy servers. The system uses hierarchical certification infrastructure for management and verification of certificates.