6) In cryptography, a block cipher mode of operation is an algorithm that uses a block cipher to provide an information service such as confidentiality or authenticity. One of the block cipher mode of operation is random counter mode. Please explain how random counter mode can be implemented through drawing the schematic view and explaining the way that this method works [I point] 7) In cryptography, Diffie-Hellman is an algorithm used to establish a shared secret between two parties. It is primarily used as a method of exchanging cryptography keys for use in symmetric encryption algorithms like AES. How does Diffie-Hellman key exchange work? Please explain your answer with example [ point