AES
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Does AES use the same key to lock and unlock data?
2. Is it safe to share the AES key with anyone who wants it?
3. Which is harder to crack: a longer AES key, or a shorter AES key?
4. Can an AES key be 128, 192, or 256 bits long?
5. Can an AES key be any length someone chooses?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1Lock data with AES | AChoosing a 256 bit key over a 128 bit key | |
| 2Unlock data with AES | BThis breaks security - anyone could unlock the data | |
| 3AES uses just one key for both jobs | CUses the shared key | |
| 4A longer AES key is harder to crack | DUses that exact same shared key | |
| 5Sharing the AES key with everyone | ELock and unlock with the same key | |
| 6Using a 300 bit AES key | FThis isn't valid - AES only supports 128, 192, or 256 bit keys |
C
Definitions
AES
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
AES uses one ______
key to lock and unlock data.
2.
A longer key is ______
to crack than a shorter one.
3.
AES keys can be 128, 192, or 256 ____ long.
4.
AES is a type of _________ encryption.
5.
AES is widely used to keep stored and sent
data ____.
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
AES uses two separate keys
B
AES uses one shared key
C
The key locks and unlocks data
Question 2
A
Long keys are harder to crack
B
Short keys are harder to crack
C
AES key can be 256 bits long
Question 3
A
128 bits is a valid AES length
B
192 bits is a valid AES length
C
999 bits is a valid AES length
Question 4
A
AES is symmetric encryption
B
AES uses one shared key
C
The key must stay secret
D
AES uses a public private key
Question 5
A
Different keys lock and unlock
B
The same key locks and unlocks
C
AES key can be 128 bits long
Answer Key
AES
Section A: Quick Questions
Q1
A — Yes
Q2
A — No
Q3
B — A longer AES key
Q4
A — Yes
Q5
B — No
Section B: Match the Pairs
Q1
Lock data with AES → Uses the shared key
Q2
Unlock data with AES → Uses that exact same shared key
Q3
AES uses just one key for both jobs → Lock and unlock with the same key
Q4
A longer AES key is harder to crack → Choosing a 256 bit key over a 128 bit key
Q5
Sharing the AES key with everyone → This breaks security - anyone could unlock the data
Q6
Using a 300 bit AES key → This isn't valid - AES only supports 128, 192, or 256 bit keys
Section C: Definitions
Q1
AES — A widely used method of symmetric encryption that uses one shared key, which can be 128, 192, or 256 bits long, to lock and unlock data.Section D: Fill in the Blanks
Q1
AES uses one shared
key to lock and unlock data.Q2
A longer key is harder
to crack than a shorter one.Q3
AES keys can be 128, 192, or 256 bits long.Q4
AES is a type of symmetric encryption.Q5
AES is widely used to keep stored and sent
data safe.Section E: Spot the Error
Q1
A — Line 1 says AES uses two separate keys, but AES uses just one shared key for both locking and unlocking.
Q2
B — Line 2 says short keys are harder to crack, but longer keys are actually harder to crack.
Q3
C — Line 3 says 999 bits is valid, but AES only supports 128, 192, or 256 bit keys.
Q4
D — Line 4 says AES uses a public and private key, but AES uses one shared key for both locking and unlocking.
Q5
A — Line 1 says different keys lock and unlock the data, but AES uses the same key for both.