Webcard is a Java application that implements a TCP /IP stack and HTTP server and runs on a Schlumberger Cyberflex Access smartca.rd. In this report, we describe the architecture and implementation of Webcard and the constraints and assumptions that influenced its design. Complete sources for the application and its supporting environment are available.
We describe the implementation of the Shoup-Rubin key distribution protocol. This protocol stores long-term keys on a smartcard and uses the cryptographic capability of the card to generate and distribute session keys securely. The designers of the protocol provide a mathematical proof of its security, using techniques pioneered by Bellare and Rogaway. Combining this theoretical strength with our implementation on tamper resistant hardware results in practical and powerful middleware functionality, useful in applications that demand strong authentication and confidentiality.
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