Keeping information safe
Answers are for parents and teachers.
1
Match each malware to its job: virus, worm, spyware, ransomware. Jobs: (a) locks files for money, (b) spreads by itself over a network, (c) collects information secretly, (d) attaches itself to a file.
virus: d; worm: b; spyware: c; ransomware: a.
2
A code has 4 places and each place holds one of 10 digits. How many codes are there? What if a fifth place is added?
10 × 10 × 10 × 10 = 10,000. With five places: 10,000 × 10 = 100,000.
3
Decode LQIRUPDWLRQ with a shift of 3 (move each letter three places back).
INFORMATION. (L→I, Q→N, I→F, R→O, U→R, P→M, D→A, W→T, L→I, R→O, Q→N.)
4
Name three signs that a message may be phishing, and say what you do.
It asks for a secret, it hurries you, the sender is unknown or odd. Do not click or reply; tell a trusted adult.
5
Explain in two sentences why a public key can safely be shown to everybody.
A public key can only lock a message. Only the private key, which stays secret with the owner, can open it.