ACARA Digital Technologies Years 7–8 Crossword: Networks and Cyber Threats (Modules 674–695)
Name:
Date:
Class:
✎
Crossword
Read each clue and write the matching term in the grid. Numbers in brackets show the letters in each word.
1
2
3
4
5
6
7
8
Across
- 1. Move each plaintext letter forward along the alphabet by the key number. With a key of 3, A becomes D. Write the new letter and keep spaces unchanged. Word 1 of: ______ shift __________ (6)
- 3. To scramble data so nobody can read it without the key. This keeps private things like messages, passwords and bank details safe if someone steals or intercepts them. (7)
- 4. To decrypt a Caesar ciphertext, move each letter back along the alphabet by the ______ number to get the plaintext. A wraps back to Z. Then check the result is a real message. Word 4 of: shift back by ___ (3)
- 5. Trying every possible key, such as all 25 Caesar shifts, until readable text appears. A cipher with so few keys is weak because an attacker can check them all quickly. Word 1 of: _____ _____ (5)
- 7. Counting how often each letter appears in ciphertext. The most common letter probably stands for E, so an attacker can work out the key. Word 2 of: frequency ________ (8)
- 8. A tool with two alphabet rings. Turn the inner ring to the key shift so each plaintext letter lines up with its ciphertext letter on the outer ring. ROT13 is a shift of 13. Word 1 of: ______ wheel (6)
Down
- 1. A website or alert that tells you if your email address appeared in a known data breach, so you can change the password for any affected account. Word 2 of: breach _______ (7)
- 2. Word 3 of the term in 1 Across: ______ shift __________ (10)
- 5. One-time codes that let you log in if you lose your MFA device. Keep them somewhere safe, like printed in a safe place, and never share them. A trusted adult can help with recovery. Word 1 of: ______ codes (6)
- 6. Word 2 of the term in 5 Across: _____ _____ (5)
Answer Key
ACARA Digital Technologies Years 7–8 · Modules 674–695
1C
A
2E
S
A
R
H
N
3E
N
C
R
Y
P
T
C
R
4K
E
Y
E
P
5B
R
U
T
E
A
I
6F
C
O
O
K
7A
N
A
L
Y
S
I
S
R
U
8C
I
P
H
E
R
E
Across
1CAESAR — Move each plaintext letter forward along the alphabet by the key number. With a key of 3, A becomes D. Write the new letter and keep spaces unchanged. Word 1 of: ______ shift __________
3ENCRYPT — To scramble data so nobody can read it without the key. This keeps private things like messages, passwords and bank details safe if someone steals or intercepts them.
4KEY — To decrypt a Caesar ciphertext, move each letter back along the alphabet by the ______ number to get the plaintext. A wraps back to Z. Then check the result is a real message. Word 4 of: shift back by ___
5BRUTE — Trying every possible key, such as all 25 Caesar shifts, until readable text appears. A cipher with so few keys is weak because an attacker can check them all quickly. Word 1 of: _____ _____
7ANALYSIS — Counting how often each letter appears in ciphertext. The most common letter probably stands for E, so an attacker can work out the key. Word 2 of: frequency ________
8CIPHER — A tool with two alphabet rings. Turn the inner ring to the key shift so each plaintext letter lines up with its ciphertext letter on the outer ring. ROT13 is a shift of 13. Word 1 of: ______ wheel
Down
1CHECKER — A website or alert that tells you if your email address appeared in a known data breach, so you can change the password for any affected account. Word 2 of: breach _______
2ENCRYPTION — Word 3 of the term in 1 Across: ______ shift __________
5BACKUP — One-time codes that let you log in if you lose your MFA device. Keep them somewhere safe, like printed in a safe place, and never share them. A trusted adult can help with recovery. Word 1 of: ______ codes
6FORCE — Word 2 of the term in 5 Across: _____ _____