Message integrity can be bypassed if an attacker captures a message in transit, modifies it and then generates a new hash. Since hashing algorithms are public, the recipient of a message could not tell that the message and the hash were manipulated in transit. Which of the following options prevent the situation? (2 Points) Using stronger public hashing algorithms Using keyed hashing algorithms None of the other options Suppose Alice has sent Bob a signature attached to a plaintext document. The figure below illustrates the process. What key does Bob need to use to verify Alice's signature? * 4)(2 Points) hed to a plaintext document. The figure below Suppose Alice has sent Bob a signature attached to a plaintext document. The figure below illustrates the process. What additional knowledge does he need to have to be able to verify the key? * [4) (2 Points) cker captures a message in transit, modifies it and Suppose Alice and Bob need to exchange a shared secret. However they have not communicated before. What algorithm can they use to generate this secret and securely share it over a communications channel? (4 Points) Suppose Alice wants to use a keyed hashing algorithm to implement the integrity service on messages she sends to Bob. The figure below illustrates the setup. What do Alice and Bob need to agree on in order for the setup to work? (2 Points)