WorksheetsAES and Cryptography Quiz
Total questions: 31
Worksheet time: 16mins
AES is used for:
Symmetric encryption
Hashing
Digital signatures
QR codes
Symmetric encryption uses:
Two keys
One key
No keys
Only public keys
The main purpose of AES is to provide:
Hashing
Confidentiality
Scanning
Compression
Which statement describes hashing?
Reversible process
Non-reversible process
Uses two keys
Encrypts files
Hashing is commonly used to:
Store passwords
Lock doors
Delete files
Reduce file size
SHA-256 is a type of:
Symmetric key
Hashing algorithm
Digital signature
Image format
HMAC is used to ensure:
Integrity
Hair growth
Battery backup
Internet speed
Integrity means:
Data has not been changed
Data is colourful
Data is loud
Data is stored in the cloud
A digital signature is used to:
Identify sender
Play games
Change the file size
Upload files
Digital signatures use:
Maths to sign documents
Typing signatures
Voice messages
Screenshots
Which is an example of data that must be hashed?
Passwords
Photos
Fonts
Emojis
Ciphertext is:
Scrambled/Encrypted data
Typo in messaging
A website
A virus
Plaintext is:
Secret code
Readable message
Hash value
A QR scan
AES encryption helps protect:
WhatsApp messages
Water bottles
Shoes
Electricity bills
A hash value changes completely when:
You change 1 letter
You restart your PC
You delete the file
You copy the file
Which is NOT a hashing algorithm?
SHA-256
BCrypt
AES
SHA-1
Digital signatures prevent:
Forgery
Photocopying
Forgetting passwords
Mouse lag
Integrity + authenticity together help ensure:
Correct sender + unchanged message
Faster Wi-Fi
Bright images
Shorter videos
AES is considered secure because:
It uses strong mathematical keys
It is colourful
It runs on Windows only
It was invented by a gamer
Digital signatures are used in:
DocuSign
Video games
Instagram filters
Car engines
AES Task (Easy Crypto Challenge)
Encrypt this by replacing each letter with the next one: HELLO → ?
(a)
If AES uses ONE key, what happens if someone steals that key?
They can decrypt everything
Nothing changes
Phone explodes
It becomes Wi-Fi
Which one is MOST LIKELY a hash?
apple123
5e884898da28047151d0e56f8dc62927
dog
mypassword
HMAC Guessing Game If someone changes ONE letter in a message, what happens to the HMAC?
Stays same
Changes completely
Turns into emoji
Digital Signature Mystery Someone sends you a file. How do you check if it’s really from them?
Ask your friend
Check the digital signature
Download again
Open and hope
Hash Game Is this statement TRUE or FALSE? “You can reverse a hash to get the original password.”
(a)
Spot the Secure One Which storage method is safest for passwords?
Hashing
AES
Writing in notebook
Tattoo
Unscramble the word:
G I S I N L A T U D E R E
(a)
Decrypt this message (Shift –3): KHOOR ZRUOG
(a)
Rule: Swap vowels
A↔E, I↔O, U stays U
Consonants stay same.
Encrypt:
WORD: MESSAGE
A. MISSIGO
B. MISSAGE
C. MESSAGO
D. MISSIGE
Rule: Convert numbers back to letters.
Decrypt:
23–15–18–11
A. WORD
B. WORK
C. WARM
D. WARN
