Hitoshi Kokumai

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Defense against Persistent Threats by Expanded Password System

Defense against Persistent Threats by Expanded Password System2 Channel Expanded Password System

Episodic image memory, that enables us to re-generate high-entropy authentication codes and cryptographic keys, also helps us achieve such objectives as to

(1) prevent OTP token from getting compromised

(2) come up with very resilient 2-channe/factor authentication

(3) thwart hard-to-prevent inside jobs.

as discussed in “Advanced Persistent Threats in Digital Identity” 

Authority-Distributed CryptoMnemo

for Windows V1.0

An encryption key, which had been destroyed at the end of the previous run,
will be reproduced when (only when) 3 users work together.


Encryption Key

Regeneration B Encrypt/Decrypt > Deletion

Key References 

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

Impact of Episodic Memory on Digital Identity

Summary and Brief History - Expanded Password System

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

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

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 

If only textand # are OK |3UV B99 KUW


to memorize 10 lighten the load of to make use of
text/number passwords text passwords memorized images

{Text Mode] {Graphics Mode] (Original Picture Mode]
Recall the remembered Recognize the pictures Recognize the unforgettable
password remembered in stories pictures of episodic memories |
012345 @ 0% 8 sROaw
crreas YE
CDEFGH 8 4 &

nr HER


Low memory ceiling High memory ceiling Very high memory ceiling

Think of all those ladders you have to cmb in Donkey Kong ;-)

 < 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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