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Grade 9 Cybersecurity & Passwords Worksheet with Answers
Grade 9 (US) · Year 10 (UK) · Class 9 (India) · Computer Science
Unit 5: Networks & CybersecurityCybersecurity
Password strength by counting combinations, spotting threats, and simple encryption. This free high school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.
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Practice Sheetaethelsystems.comCybersecurity & Passwords
Grade 9 · Computer Science
Name
Class
Date
Learning goal: Cybersecurity
Directions: Read each question carefully and write your answer on the line. Use the diagram to help you.
RememberStaying secure
- 1
A Caesar cipher moved every letter 3 forward. Decrypt: EBWH
- 2
A Caesar cipher moved every letter 2 forward. Decrypt: EQFG
- 3
A password is 3 lowercase letters (a–z). How many passwords are possible?
- 4
A Caesar cipher moved every letter 2 forward. Decrypt: FCVC
- 5
A Caesar cipher moved every letter 1 forward. Decrypt: DMPVE
- 6
A Caesar cipher moved every letter 3 forward. Decrypt: GDWD
- 7
A PIN has 3 digits (0–9). How many different PINs are possible?
- 8
A Caesar cipher moved every letter 3 forward. Decrypt: FORXG
- 9
A Caesar cipher moved every letter 1 forward. Decrypt: TBGF
- 10
A Caesar cipher moved every letter 1 forward. Decrypt: EBUB
- 11
A PIN has 6 digits (0–9). How many different PINs are possible?
- 12
A password is 2 lowercase letters (a–z). How many passwords are possible?
★ Challenge corner for fast finishers
In a list of every 4-bit pattern, how many patterns have exactly one 1?
How did I do?
Teacher's comments
Free printable worksheets with answer keys · aethelsystems.com/worksheets/computer/9/cybersecurity
Answer key — Cybersecurity & Passwords (Grade 9)
- 1.byte
- 2.code
- 3.17,576
- 4.data
- 5.cloud
- 6.data
- 7.1,000
- 8.cloud
- 9.safe
- 10.data
- 11.1,000,000
- 12.676
- ★4
Answer key (click to show)
- 1.byte
- 2.code
- 3.17,576
- 4.data
- 5.cloud
- 6.data
- 7.1,000
- 8.cloud
- 9.safe
- 10.data
- 11.1,000,000
- 12.676
- ★4 (challenge corner)
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