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Expanded Password System – Theory and Implementation


Expanded Password System, however solid the theory is, would be vulnerable to attacks when it is poorly implemented.

Very fortunately, our first client in Japan who adopted Expanded Password System for 140,000 shoppers (designed for one million users) was extremely demanding about the implementation.  We had to satisfy them and actually satisfied them with the solid implementation.  Another major client is Japanese army. We naturally had to be very confident about the good implementation.

For both theory and implementation, we owe a lot to Emeritus Prof. Hideki Imai, who was the chairperson of Japan’s CRYPTREC and also a cryptography advisor to the defense forces when we first met in 2001.  He pushed my back to move ahead confidently with promotion of Expanded Password System, and helped me a lot with several joint research programs until he retired from Tokyo University. It is from him that I came to know about the likes of Elliptic Curve Cryptography.

Expanded Password System has thus been strongly disciplined and hardened in both theory and implementation.

Click the link for more - https://www.linkedin.com/pulse/proposition-how-build-sustainable-digital-identity-platform-kokumai/


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