Locking a device screen

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Quick Questions

Shade in the A or B circle for each question.

1. You put your tablet down to get a snack. What should you do first?

A Leave it open so it is ready when you get back

B Lock the screen so no one else can use it

2. Which statement about a screen lock is true?

A It needs a passcode, passphrase or fingerprint to open the device

B It lets anyone open the device by tapping the screen

3. Your friend asks for your passcode so they can play a game on your phone. What is the safe choice?

A Keep your passcode private and say no politely

B Tell them, because they are your friend

4. Which one is a screen lock that uses your body?

A Wallpaper picture

B Fingerprint or face unlock

5. Which passcode is the better choice for a screen lock?

A A passcode that is hard to guess and that you keep to yourself

B 1234 because it is easy to remember

Match the Pairs

Draw a line connecting each item on the left to its match on the right.

Left column		Right column
1screen lock		AThe screen is locked after leaving the desk. It should be locked before you walk away, or someone could use the device first.
2fingerprint unlock		BA lock that needs a passcode, passphrase or fingerprint to open your device, so other people cannot use it when you walk away.
3Lock your screen as soon as you walk away from your device		Clock_screen() # before leaving the desk
4Keep your passcode secret and do not share it with friends		Dpasscode = "private"
5passcode = "1234" share(passcode, "friend")		EOpens your device by checking your own fingerprint, so only you can get in.
6leave_desk() lock_screen()		FThe passcode is shared with a friend. A screen lock only works if the passcode stays private, so do not share it.

Definitions

screen lock

Fill in the Blanks

Complete each line of code by filling in the missing parts.

IF walkingAway THEN __________() END IF

IF friendAsksForPasscode THEN sharePasscode ← _____

IF fingerprintMatches THEN unlockDevice() ____ keepLocked()

IF fingerprintMatches __ faceMatches THEN unlockDevice()

IF typedCode _ savedPasscode THEN unlockDevice() ELSE keepLocked()

Spot the Error

Shade in the letter of the line that contains an error.

Question 1

A IF I leave my tablet

B press the lock button

C tell my mate my passcode

D END IF

Question 2

A SET unlock TO fingerprint

B SET lock_time TO never

C IF screen idle for lock_time

D lock the screen

Question 3

A SET passcode TO my birthday

B SHOW passcode to nobody

C LOCK screen WITH passcode

Question 4

A SET unlock TO face_or_finger

B IF face matches owner

C unlock the phone

D ELSE unlock the phone anyway

Question 5

A IF I finish using my laptop

B close the lid or press lock

C screen stays open for anyone

D END IF

Answer Key

Locking a device screen

Section A: Quick Questions

B — Lock the screen so no one else can use it

A — It needs a passcode, passphrase or fingerprint to open the device

A — Keep your passcode private and say no politely

B — Fingerprint or face unlock

A — A passcode that is hard to guess and that you keep to yourself

Section B: Match the Pairs

screen lock → A lock that needs a passcode, passphrase or fingerprint to open your device, so other people cannot use it when you walk away.

fingerprint unlock → Opens your device by checking your own fingerprint, so only you can get in.

Lock your screen as soon as you walk away from your device → lock_screen() # before leaving the desk

Keep your passcode secret and do not share it with friends → passcode = "private"

passcode = "1234" share(passcode, "friend") → The passcode is shared with a friend. A screen lock only works if the passcode stays private, so do not share it.

leave_desk() lock_screen() → The screen is locked after leaving the desk. It should be locked before you walk away, or someone could use the device first.

Section C: Definitions

screen lock — A lock that needs a passcode, passphrase or fingerprint to open your device, so other people cannot use it when you walk away from it.

Section D: Fill in the Blanks

IF walkingAway THEN
  lockScreen()
END IF

IF friendAsksForPasscode THEN
  sharePasscode ← FALSE

IF fingerprintMatches THEN unlockDevice()
ELSE keepLocked()

IF fingerprintMatches OR faceMatches THEN
  unlockDevice()

IF typedCode = savedPasscode THEN
  unlockDevice()
ELSE keepLocked()

Section E: Spot the Error

C — A passcode must stay private. Telling a friend means they could unlock your tablet. It should say to keep my passcode secret.

B — If the lock time is never, the screen will not lock by itself and anyone can use the device. It should be a short time, like 30 seconds.

A — A birthday is easy for other people to guess. The passcode should be hard to guess.

D — If the face does not match the owner, the phone must stay locked. Unlocking it anyway defeats the screen lock.

C — A screen lock should ask for the passcode so other people cannot use the laptop. It should not stay open for anyone.