On-the-fly regeneration of cryptographic keys made feasible by our episodic memory

Hitoshi Kokumai
2 min readMay 3, 2021

Expanded Password System, that provides ‘wide choice of secret credentials’ and enables us to intuitively manage ‘correspondence between accounts and passwords’, makes it easily practicable to get cryptographic keys re-generated on-the-fly from what we had firmly remembered as episodic memory.

This function helps with the safe account recovery, especially for distributed/decentralized identity management systems such as self-sovereign identity as outlined here — “Account Recovery withExpanded Password System”

Key References

Impact of Episodic Memory on Digital Identity

Summary and Brief History — Expanded Password System

For Achieving Solid Digital Identity on Information Security Buzz (Mar/2021)

What We Know for Certain about Authentication Factors

Digital Identity for Global Citizens

Image-to-Code Conversion by Expanded Password System

Account Recovery with Expanded Password System

Proposition on How to Build Sustainable Digital Identity Platform

Additional References

Removal of Passwords and Its Security Effect

Negative Security Effect of Biometrics Deployed in Cyberspace

External Body Features Viewed as ‘What We Are’

History, Current Status and Future Scenarios of Expanded Password System

Availability-First Approach

Update: Questions and Answers — Expanded Password System and Related Issues

< Videos on YouTube>

Slide: Outline of Expanded Password System (3minutes 2seconds)

Digital Identity for Global Citizens (10minutes — narrated)

Demo: Simplified Operation on Smartphone for consumers (1m41s)

Demo: High-Security Operation on PC for managers (4m28s)

Demo: Simple capture and registration of pictures by users (1m26s)

Slide: Biometrics in Cyber Space — “below-one” factor authentication

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Hitoshi Kokumai

Advocate of ‘Identity Assurance by Our Own Volition and Memory’, Inventor of Expanded Password System and Founder of Mnemonic Identity Solutions Limited in UK.