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Grade 10 Cybersecurity & Passwords Worksheet with Answers

Grade 10 (US) · Year 11 (UK) · Class 10 (India) · Computer Science

Unit 4: Networks & SecurityCybersecurity

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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Cybersecurity & Passwords

Grade 10 · Computer Science

Score___ / 12

Name

Class

Date

Learning goal: Cybersecurity

Directions: Read each question carefully and write your answer on the line. Use the diagram to help you.

Example

Which is the strongest password: Blue$Kite!92, myname2010 or qwerty?

Answer: Blue$Kite!92

RememberStaying secure

Long passwordsmore characters =many more guessesMix charactersa–z, A–Z, 0–9, !#more choices per slotEncryptionscrambles data witha keyPhishingfake messages thatask for passwords
  1. 1

    A password is 4 lowercase letters (a–z). How many passwords are possible?

    ?26choices×?26choices×?26choices×?26choices
  2. 2

    A Caesar cipher moved every letter 3 forward. Decrypt: VDIH

    ADBECFDGEHFIGJHKILJMKNLOMPNQORPSQTRUSVTWUXVYWZXAYBZCCode: VDIH
  3. 3

    A Caesar cipher moved every letter 2 forward. Decrypt: NQIKP

    ACBDCEDFEGFHGIHJIKJLKMLNMONPOQPRQSRTSUTVUWVXWYXZYAZBCode: NQIKP
  4. 4

    A password is 2 lowercase letters (a–z). How many passwords are possible?

    ?26choices×?26choices
  5. 5

    A PIN has 5 digits (0–9). How many different PINs are possible?

    ?10choices×?10choices×?10choices×?10choices×?10choices
  6. 6

    A PIN has 3 digits (0–9). How many different PINs are possible?

    ?10choices×?10choices×?10choices
  7. 7

    A Caesar cipher moved every letter 3 forward. Decrypt: ORJLQ

    ADBECFDGEHFIGJHKILJMKNLOMPNQORPSQTRUSVTWUXVYWZXAYBZCCode: ORJLQ
  8. 8

    A Caesar cipher moved every letter 1 forward. Decrypt: DPEF

    ABBCCDDEEFFGGHHIIJJKKLLMMNNOOPPQQRRSSTTUUVVWWXXYYZZACode: DPEF
  9. 9

    A password is 3 lowercase letters (a–z). How many passwords are possible?

    ?26choices×?26choices×?26choices
  10. 10

    A Caesar cipher moved every letter 2 forward. Decrypt: EQFG

    ACBDCEDFEGFHGIHJIKJLKMLNMONPOQPRQSRTSUTVUWVXWYXZYAZBCode: EQFG
  11. 11

    A Caesar cipher moved every letter 2 forward. Decrypt: DAVG

    ACBDCEDFEGFHGIHJIKJLKMLNMONPOQPRQSRTSUTVUWVXWYXZYAZBCode: DAVG
  12. 12

    A Caesar cipher moved every letter 3 forward. Decrypt: FORXG

    ADBECFDGEHFIGJHKILJMKNLOMPNQORPSQTRUSVTWUXVYWZXAYBZCCode: FORXG

★ Challenge corner for fast finishers

How many different patterns can 7 bits make?

6432168421

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/computer/10/cybersecurity

Answer key (click to show)
  1. 1.456,976
  2. 2.safe
  3. 3.login
  4. 4.676
  5. 5.100,000
  6. 6.1,000
  7. 7.login
  8. 8.code
  9. 9.17,576
  10. 10.code
  11. 11.byte
  12. 12.cloud
  13. ★128 (challenge corner)

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