Rolling Thunder Security CYBERSECURITY FUNDAMENTALS PKI INTERACTIVE LAB

Pick the Right Key

For each scenario, choose the key that completes the operation correctly. Wrong picks explain exactly what would go wrong in the real world.
First-try score
0 / 8
SCENARIO 01 OF 08
ENCRYPT
Confidentiality: Alice → Bob
Alice wants to send Bob a confidential business proposal over the public internet. Eve is sniffing the wire. The goal is secrecy: only Bob should be able to read this message.
Which key should Alice use to encrypt the plaintext?
Operator
Alice
Input
plaintext
Operation
ENCRYPT
◇ Key: ?
Output
awaiting key...
Recipient
Bob
Lab Complete
0 / 8
Excellent work
The Four Rules of Key Selection
Encrypt
To send a confidential message to someone, encrypt with their PUBLIC key. Only their private key can reverse it.
Decrypt
To read a confidential message sent to you, decrypt with your own PRIVATE key.
Sign
To sign a message as yourself, encrypt the hash with your own PRIVATE key. Only you have it.
Verify
To verify a signature is from someone, decrypt it with their PUBLIC key. Match the hashes to confirm.