Hitoshi Kokumai

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Password Manager or Expanded Password System


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Generating High-
Entropy Password like



“Expanded Password System is no bad, but we do not need it.  We can rely on password managers that are protected by a single strong password.  Password predicament is already sort out by password managers”. This is what we often hear here and there.

Then, what if we come up with a password manager powered by Expanded Password System (EPS)?

It is ‘leak-proof’; the passwords, which are generated and re-generated on-the-fly by our image-to-code converter from users’ hard-to-forget episodic image memory, will be deleted from the software along with the intermediate data when it is shut down.

The merits of episodic image memory enable us to easily handle multiple password managing modules with multiple unique sets of images; it helps us avoid creating a single point of failure.

The logic of ‘image-to-code’ conversion is demonstrated at our website. Everyone can freely try and experience the flow of process here - https://www.mnemonicidentitysolutions.com/

We expect the EPS-powered password manager to be a good tool to actually bring a healthy second life to ubiquitous legacy password systems.

Please keep an eye on the progress.


“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


Key References 

 Bring a healthy second life to legacy password systems

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

Relation of Accounts & Passwords


* Unique matrices of images allocated to different accounts.

+ Ata glance you will immediately realize what images you should pick
up as your passwords for this or that account.

Additional References

Removal of Passwords and Its Security Effect

Step-by-Step Analysis of Why and How Biometrics Brings Down Security

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 

Ifonlytextand fare OK [SUV BIOKUW

to memonze
text/number passwords

{Text Mode)
Recall the remembered

J 2


<veco N=

Ox ma

XxXBFr mow



Low memory ceiling

to lighten the load of

text passwords


{Graphics Mode)
Recognize the pictures
remembered mn stones


High memory ceiling



to make use of
memorized images

{Ongimal Picture Mode)

Recognize the unforgettable
pictures of episodic memories

sRBO yr
L@ S00




Very high memory cuiding

— Think ofall those adders you have to climb in Donkey Kong 1+)


 < 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

Secret Credenti



Episodic Memory
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