Question

You just received a message from the internet which was encrypted with asymmetric encryption. what do you need to do to read theâ message?

a. you need the decryption algorithm to decrypt the message so you can read it.

b. you need the encryption algorithm so you can decrypt the message and read it.

c. you need the key it was encrypted with to decrypt it so you can read the message.

d. you need the public key so you can decrypt the message and read it.

e. you need the private key to decrypt the message so you can read it.

Answer 1

Assuming the data was encrypted with YOUR public key, you'll need YOUR private key to decrypt it. That's answer e.

a and b are not solutions by themselves, of course you need to use the decryption algorithm, but a key goes with it.

c would be about symmetric encryption, but this is asymmetric, so different keys are used for encryption and decryption

d is possible, but it would mean anyone can decrypt it (after all the key is public), so then there's no point in encrypting it in the first place.

So e is the only logical answer.