Chapter 2: Keeping Information Safe

Keeping Information Safe 🗝️

Private Stays Private!

In Chapter 1, we learned how devices work and how they connect. Now let’s learn how to keep the information on them safe.

Information is anything we know. Your name is information. So is a photo, a drawing, or a password. Some information is fine to share. Some needs to be locked up tight! Let’s find out which is which.

Private or Public? 🔒

private information belongs only to you and your family. It stays secret.

public information is okay for other people to know.

Private things:

Your home address.
Your phone number.
Your passwords.
Your full birthday, with the day and the year.
Where you are right now.

Public things:

Your favorite color.
Your favorite animal.
Your favorite book.
What you like to draw.

Not sure? Then treat it as private until a grown-up says it is okay.

Who Gets to Know?

Even private information has a few people who can know it.

You know your password.
Your grown-ups at home can know it, so they can help you.
Your teacher may know your school password, so they can help in class.

Who should not know? A friend, even a best friend. Someone online you have never met. A pop-up or a game that asks for it. If your best friend asks for your password, you can say, “Sorry! Private stays private.”

Three Ways to Keep Information Safe

People who keep information safe have three big jobs:

Keep it secret. Only the right people can see it.
Keep it right. Nobody changes it when they should not.
Keep it ready. It is there when you need it.

Grown-up security helpers call these three jobs the CIA Triad. A triad is a group of three.

Who Are You? Passwords and Passkeys 🔑

Before your tablet lets you in, it asks a question: “Who are you?” You have to prove it is really you. This is how devices keep strangers out.

Here are ways a person can show they are allowed in:

A password is a secret word. It can have letters, numbers, and symbols.
A PIN is a short secret number.
A picture password means tapping pictures in a secret order.
A fingerprint sensor reads the bumps and swirls on your finger.
Face unlock uses the camera to check your face.
A badge or card has a special code. Some schools give young students a card to scan.

Good Password Habits

Make it long and hard to guess. Your name or “1234” is too easy!
Never share it, except with your grown-up.
Do not stick it on your device. A note on the tablet is like taping the key to the door.

Passkeys: A Newer Kind of Key

A passkey is a secret key that lives on your device. You do not type it. You unlock it with your face, your finger, or a PIN.

Here is the super power: a passkey only works on the real app or website it was made for. If a trick website pretends to be your game, the passkey will not work there. Tricksters cannot steal a key you never type! A grown-up sets up passkeys.

Locks All Around Us 🚪

Some security keeps things you can touch safe. Look around. Locks are everywhere!

A lock and key on your front door.
A lock on a bike.
A fence and gate around the playground.
A front door at school that only opens when the office lets a visitor in.
A visitor badge that shows a guest has checked in.
A locked cart where the class tablets sleep at night.
A security camera that watches a door.

All of these are physical security. Physical means real things you can touch.

Every Safety Tool Has a Job

Each safety tool stops a different problem:

A lock on the tablet cart stops someone from taking the tablets.
A password stops someone from pretending to be you.
An update stops sneaky code from slipping through a hole.
A saved copy in the cloud stops your work from being lost for good.
A visitor badge helps grown-ups see who belongs in the school.
Getting apps from the real app store, with a grown-up, stops fake apps from getting onto your device.

Layers and Secret Codes 🏰

Long ago, castles had lots of ways to stay safe. A moat of water. Tall walls. A strong gate. Guards on the towers. If one did not stop a problem, the next one could.

That idea is called defense in depth. It means many layers of safety working together.

Your tablet has layers too:

A lock screen that needs a password, PIN, or face.
Updates that close safety holes.
A school filter that blocks unsafe websites.
A grown-up who helps you when something seems wrong.

It is like riding a bike. A helmet, knee pads, and a careful rider all work together!

Secret Codes

When you send a message, it travels through many computers on the way. It is a bit like a postcard. Many hands touch it, and anyone could read it. That is why we protect the ways we send information.

encryption turns a message into a secret code. Only the person with the right key can turn it back. Try a simple code: move every letter one step forward. “HI” becomes “IJ.” Apps and websites use secret codes that are much, much harder to crack.

Oops or On Purpose?

Information can get changed. Sometimes it is an accident. You tap the wrong button and a picture disappears. Juice spills on your paper drawing.

Sometimes it is on purpose. Someone scribbles on your drawing without asking. Someone changes your work while you are away.

Both are problems. Saved copies help with accidents. Locks and passwords help stop changes made on purpose. If it happens, tell a grown-up.

Private stays private!

Chapter 2 Activity: Lock It Up 🔐

With a grown-up:

Sort cards into two piles: private and public. Try address, favorite color, password, and favorite animal.
Ask your grown-up how their phone checks who they are. A PIN? A finger? A face?
Hunt for five locks at home or school. Say what each one protects.
Draw a castle with three layers of safety.
Write a secret code. Move every letter one step forward. Can your grown-up crack it?

Key Concepts Checklist

I can sort information into private and public
I know who should and should not know my password
I know three ways to keep information safe: secret, right, and ready
I can name three ways a device checks who I am
I know a passkey only works on the real website or app
I can name locks and other physical security around me
I know defense in depth means many layers working together
I know encryption turns a message into a secret code