Santander Digital Trust Hackathon — Among the Winners

Hitoshi Kokumai
2 min readDec 27, 2020


It appears that our proposition is one of the 31 winners out of 268 submissions according to

Assuming that you find our discussion relevant and compelling, your support to our project would be very much appreciated.

Incidentally, I have recently come across this article — “Santander’s aspirations to be your trustedidentity custodian”

We made an entry into the Digital Trust Hackathon on @SantanderDevs’s invitation under the title of ‘Digital Identity for Global Citizens’ as per

Irrespective of how we get ranked in the contest, we are very pleased that, with this entry, we were given an excellent opportunity to present our proposition of Expanded Password System in a much easier-to-grasp format such as

- Inspiration

- What it does

- How we built it

- Challenges we ran into

- Accomplishments that we’re proud of

- What we learned

- What’s next

You might hopefully be interested to have a quick look at it, desirably along with this 90-minute video —

< References >

Summary and Brief History — Expanded Password System

Image-to-Code Conversion by Expanded Password System

Proposition on How to Build Sustainable Digital Identity Platform

External Body Features Viewed as ‘What We Are’

History, Current Status and Future Scenarios of Expanded Password System

Negative Security Effect of Biometrics Deployed in Cyberspace

Removal of Passwords and Its Security Effect

Availability-First Approach

Update: Questions and Answers — Expanded Password System and Related Issues (30/June/2020)

< Videos on YouTube>

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

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

< Latest Media Articles Published in 2020 Spring>

Digital Identity — Anything Used Correctly Is Useful

‘Easy-to-Remember’ is one thing ‘Hard-to-Forget’ is another



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.