Hitoshi Kokumai

2 years ago · 2 min. reading time · ~10 ·

Hitoshi blog


FRR (False Rejection Rages)


False Acceptance Rates and False Rejection Rates






38 (Equa ror Rates)

(more accurate)



00 100 ar 100 10
FAR (Fale Accegtarce Rates)

Observation 1: “Voice ID technology is dramatically cutting fraud in banking”, as claimed in this article. https://www.thinkdigitalpartners.com/news/2021/08/18/biometrics-finding-its-voice/

Observation 2: Biometrics brings down identity security, as examined in this post – “Step-by-Step Analysis of Why and How Biometrics Brings Down Security” 

This conflict will be quickly sorted out if we assume that cases of bank fraud are dramatically cut by the other security measures implemented along with voice biometrics.

If ‘the other security measures’ had been implemented on their own without involving security-lowering voice biometrics, cases of bank fraud could well have been cut even more dramatically.

                                                 Probabilistic Nature of Biometrics

Distracted “A


Key References 

 “What we need to do for NOT achieving Solid Digital Identity”

Removal of Passwords and Its Security Effect 

Negative Security Effect of Biometrics Deployed in Cyberspace

External Body Features Viewed as ‘What We Are’

“Expanded Password System

wane = Only I can select all of
BS] them correctly

Broader choices with both images and characters accepted






Easy to manage relenons between accounts and corresponding passwords.


Torturous login is history. Login is now comfortable, relaxing and healing


Additional References

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

Summary and Brief History - Expanded Password System

Proposition on How to Build Sustainable Digital Identity Platform

Account Recovery with Expanded Password System 

 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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