Key, Code, Card

1. What your child learns and why

Your child sorts passes into three kinds: something you have (key, card), something you know (code) and something you are (finger, face). They crack invented codes from clues. Older children see why “two things together” is safer and why personal cards are tidier than a shared code. Finger and face are mentioned lightly: they are very personal data, and adults decide about them.

2. Three questions for dinner

• “How do we get into our home and the building — with something we have, know or are?”
• “Why are a card and a code together safer?”
• “Which code at home is the adults' secret?”

3. 15 minutes together, no screen — the club's secret code

1. Choose a club door and invent a secret code together (knocks, a gesture, three digits).
2. Make a who-comes-in log: everyone draws their sign, no names.
3. Take turns being the door guard.

4. What success looks like

• Your child sorts at least six passes into the three kinds.
• They crack at least two codes and say the rule: real codes are never told and never typed on a screen.

5. Common difficulties

• Wants to learn the home alarm code → “That one is for the adults. In the game we have our own code.”
• Rushes to guess → “Read the clues again. Which digits do you already know?”

Say: “You are the door engineer.” No stories about burglars. Don't photograph fingers or faces for the game.

6. Safety

Don't share real alarm and door codes in front of your child as a game, and don't write them where they can be seen. Passwords are covered in lesson DB-IB-01 “Passwords Even a Dragon Can't Guess”. Fingerprints and faces are biometric data — European guidelines require that there is always another way in, such as a card or a key.

7. Where to go next

Next lesson: DB-PZ-06 “Mine and Ours”. Previous: DB-PZ-04 “Smoke and Heat”.

You don't need to know the answer. Say: “Let's find out together.”