Question 12 (5 points) Saved Which of the following is the most widely used approach to public-key encryption Question 12 options: SHA-512 HMAC RSA AES Question 11 (5 points) Which of the following mode of operation uses padding? Question 11 options: CFB OFB CTR CBC What is used to create a digital signature? Question 10 options: The receivers private key The senders public key The receivers public key The senders private key If the only form of attack that could be made on an encryption algorithm is brute-force, then the way to counter such attacks would be to __________ . Question 9 options: Use less keys Use more keys Use a shorter key Use a longer key Question 8 (5 points) The hash of a message that is encrypted with a symmetric-key encryption is called ______________. Question 8 options: Digital signature Message digest Message Authentication Code Block Chain Question 7 (5 points) Which of the following is used when Alice wants to send a confidential message to Bob? Question 7 options: Alice's private key Alice's public key Bob's private key Bob's public key Question 6 (5 points) Saving... __________________ is a number used only once and never repeated within a lifetime of a system or with the same key. Question 6 options: PRNG Initial Vector Counter Nonce