1. An attacker can modify both the text and check if they only know part of the encrypted message

a. True

b. False

2. There is a single authority over the root to certificate authorities to sign public keys in the PKI.

a. True

b. False

3. A keyed hash gives us a way to verify that some of our own data has not been modified by an attacker or someone who doesn't have the secret key.

a. True

b. False