Encryption: fill in the blanks: fill-in-the-blank worksheet for Grade 12, page 1 preview

Fill-in-the-blank worksheet · Computers & Digital Literacy

Encryption: fill in the blanks · Grade 12

Read 8 sentences about encryption and write the missing word in each, choosing from a word bank with a few extra words. Practices reading for meaning and topic vocabulary.

Grade 12 · ages 17 to 18
Hard
10 to 15 minutes
1 page
Free

The answer key is a separate page for grown-ups. Sign in to download it.

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The word bank and sentences

Directions: Read each sentence. Choose the best word from the word bank and write it on the line. Some words are not used.

Word bank: cross out each word as you use it
Enigma · Caesar · HTTPS · plaintext · salt · time · hash public · passwords ____ private key
1 In a · cipher, each letter shifts a fixed number of places in the alphabet.
2 A · turns data into a fixed-length fingerprint that cannot be reversed.
3 Longer keys make brute force attacks take far more ____.
4 Websites should store password hashes, never the · themselves.
5 Anyone can use your · key, but only your private key can unlock the message.
6 Codebreakers at Bletchley Park cracked messages from the German machine.
7 means the data between you and the site is encrypted.
8 Adding a unique · stops attackers from using precomputed tables.

What your child practices

Your child practices reading for meaning and topic vocabulary. The skill is “Safety, privacy and security”: protect personal information, recognize threats and make responsible choices online.

Grades and ages: Grade 12, ages 17 to 18
Time: About 10 to 15 minutes
Subject: Computers & Digital Literacy
Level: Hard for Grade 12
Answer key: Yes, for grown-ups who sign in
Printing: 1 page, US Letter or A4, low-ink option
Updated: October 15, 2026

How to use it

Try the first question together so the format is clear. Then let your child work through the rest, showing their thinking on the page. It is one of the harder sheets for Grade 12, best once the basics of the skill are secure.

An answer key comes with it as a separate page that grown-ups download after signing in.

Tip for grown-ups: Read each sentence aloud with a hum for the blank, then try each word bank word in it.

Done on paper? A grown-up can record it on the child's page in PlayOwl; downloading alone doesn't count as finished.