RSA
Name:
Date:
Class:
A
Quick Questions
Shade in the A or B circle for each question.
1. Should the public key be shared with everyone?
2. Should the private key be shared with everyone?
3. Which key locks a message meant for you: your public key, or your private key?
4. Which key unlocks that message: your public key, or your private key?
5. Is it safe to give your private key to someone else?
B
Match the Pairs
Draw a line connecting each item on the left to its match on the right.
| Left column | Right column | |
|---|---|---|
| 1Lock a message | AThis won't work - only their private key can unlock it | |
| 2Unlock a message | BGive it out openly | |
| 3The public key can be shared with anyone | CThis breaks security - only the owner should have it | |
| 4The private key must stay secret | DUses the matching private key | |
| 5Sharing your private key with a friend | EUses the public key | |
| 6Using someone else's public key to unlock their message | FNever give it to anyone else |
C
Definitions
RSA
D
Fill in the Blanks
Complete each line of code by filling in the missing parts.
1.
The ______ key can be shared with anyone.
2.
The _______ key must always stay secret.
3.
You ____ a message using the public key.
4.
You need the private key to ______ a message.
5.
Public and private keys form a matching ____.
E
Spot the Error
Shade in the letter of the line that contains an error.
Question 1
A
Public key: keep it secret
B
Private key: keep it secret
C
Both keys: always linked
Question 2
A
Public key: share it openly
B
Private key: share it openly
C
Both keys: a matching pair
Question 3
A
You lock with public key
B
You unlock with private key
C
You unlock with public key
Question 4
A
Public key: share openly
B
Private key: keep secret
C
Each person: own private key
D
Two people: same private key
Question 5
A
Keep private key to yourself
B
Public key: share with anyone
C
Both keys always come in pairs
D
Give your private key away
Answer Key
RSA
Section A: Quick Questions
Q1
A — Yes
Q2
A — No
Q3
B — Your public key
Q4
B — Your private key
Q5
A — No
Section B: Match the Pairs
Q1
Lock a message → Uses the public key
Q2
Unlock a message → Uses the matching private key
Q3
The public key can be shared with anyone → Give it out openly
Q4
The private key must stay secret → Never give it to anyone else
Q5
Sharing your private key with a friend → This breaks security - only the owner should have it
Q6
Using someone else's public key to unlock their message → This won't work - only their private key can unlock it
Section C: Definitions
Q1
RSA — A way of locking and unlocking messages using two matching keys: a public key anyone can have, and a private key kept secret by its owner.Section D: Fill in the Blanks
Q1
The public key can be shared with anyone.Q2
The private key must always stay secret.Q3
You lock a message using the public key.Q4
You need the private key to unlock a message.Q5
Public and private keys form a matching pair.Section E: Spot the Error
Q1
A — Line 1 says the public key should be kept secret, but the public key is meant to be shared openly.
Q2
B — Line 2 says the private key should be shared, but the private key must always stay secret.
Q3
C — Line 3 says you unlock a message with the public key, but only the matching private key can unlock it.
Q4
D — Line 4 says two people can share one private key, but each person's private key must stay their own.
Q5
D — Line 4 says to give away your private key, but the private key must always stay secret with its owner.