Help please

Write the formula for decrypting C. (2 poi S, and her private key is , She wants create a What is the digital digital signature for a message m. The hash of the message is 2. signature? Show all steps of your calculation. (4 pts) 4. Alice owns public key and private key

; Bob owns public key . Alice need to authenticate Bob. (6 pts) What key(s) of Bob's should Alice know? Alice picks a random challenge 64839: What should she send to Bob? Show the detail formula What does she expect Bob to send back? Show the detail formula (Write None if necessary) A and B each has their own private keys and public keys. B obtains a financial transaction request m generated by someone claims to be A. The encryption is unbreakable and the keys are not compromised. (8 pts) If the request is encrypted with A's public key Can B be certain that the request is generated by A? (1 point)