Case study

Tassu Passu — a human‑friendly password manager

A hackathon‑born concept that replaces passwords with visual stories so preschoolers and their families can log in safely. Built in 48 hours; recognized at Europe’s largest hackathon.

€10,000 — Junction 2019 €1,500 — Startup Circus Media feature
Role
UX designer Co-founder
Timeline
48 hours prototype + pitch
Status
Project no longer active

Inspiration

In 2018 I volunteered for a year at a kindergarten in Tallinn, teaching English and helping educators introduce robotics and programming. Many preschoolers were already using phones and tablets, yet couldn’t read or write. That experience sparked an idea: could we design security that a five‑year‑old can use — without text?

At Junction 2019, I joined a new team to build a prototype that turned passwords into memorable visual stories. The goal was radical simplicity: a login so intuitive a child or a grandparent could succeed on the first try.

Tassu Passu team at Junction 2019

Problem

Young children go online early but choose weak passwords or forget them. Parents often reuse simple passwords across accounts. Existing password managers are built for adults — not families with preschoolers.

  • Early device use among kids
  • Poor password hygiene
  • Parents also at risk
  • No kid‑first security UX

Solution

Tassu Passu replaces text passwords with a short sequence of images — a story that’s easy to remember and hard to brute‑force. Behind the scenes, the sequence maps to a secure hash and supports two‑factor authentication.

  • Replace text passwords with memorable visual stories
  • Provide separate child and parent dashboards for family management
  • Secure passwords using blockchain encryption and two‑factor verification
🐮🥑🛸🏕🦸🏻‍♀️
A memorable story that becomes a strong cryptographic secret.

Experience design

Child flow

Tap to pick characters, places and objects to tell a tiny story.

GIF animation of the story creation.

Parent dashboard

Manage accounts, set app access, and add kids.

Mockup of the parent dashboard.

My process & contribution

Research & framing

  • Mapped preschool tech habits & pain points
  • Defined family‑centric value proposition
  • Benchmarked adult password managers

UX & storytelling

  • Designed literacy‑free login interaction
  • Created story logic for image sequences
  • Produced pitch narrative & demo script

Prototype

  • Built clickable flows for both views
  • Conducted user testing
  • Shipped in 48 hours for judging

Pitch & outcomes

  • Won the Grand prize at Junction 2019 (Europe’s largest hackathon) — €10,000
  • Pitch at Startup Circus — €1,500 prize
  • Pitch at TechChill 2019

Team & pitch

Tassu Passu came to life thanks to a small, diverse team. Each of us brought a complementary skill set to the table:

Our winning Junction 2019 presentation. I designed and produced all of the visuals for our pitch deck, while Reinis delivered the winning pitch.

What I learned

Building security for very young users means eliminating friction, not understanding. Visual storytelling gave us a path to strong authentication without text. The project sharpened my rapid‑prototyping, cross‑functional collaboration and “explain complex tech simply” skills.

Media & coverage

Hive Helsinki

Student project: Tassu Passu

Mikkelin Kaupunkilehti

Local Finnish feature on Tassu Passu

Österbottens Tidning

Reporting on our €10k win

Hack Junction

Cybersecurity behind a cute design

Junction 2019 Pitch

Watch our winning presentation

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Like this project?
Get in touch

Email me, connect on LinkedIn, or check my GitHub.