Alice and Bob use a pre-shared key to exchange a confidential message. If Bob wants to send a confidential message to Carol, what key should he use?Question 29Select one:the private key of Carola new pre-shared keythe same pre-shared key he used with Alicethe public key of Bob

Bob wants to encrypt his message to Mary for secrecy. What is the correct way that he should do it?ABob uses Mary's public key to encrypt so the Mary can use her private key to decrypt the messageBBob uses Mary's private key to encrypt so the Mary can use her public key to decrypt the messageCBob uses his private key to encrypt so the Mary can use Bob's public key to decrypt the messageDBob uses his public key to encrypt so the Mary can use Bob's private key to decrypt the message

Alice and Bob would like to use an asymmetric cryptosystem to communicate with each other.  They are located in different parts of the country but have exchanged encryption keys by using digital certificates signed by a mutually trusted certificate authority. When Bob receives an encrypted message from Alice, what key does he use to decrypt the plaintext message’s contents?Alice’s public KeyAlice’s private keyBob’s public keyBob’s private key

Which type of cryptographic key is intended to be shared publicly?The symmetric keyThe private keyThe public keyThe secret key

By using asymmetric cryptography, what does Bob have to do to send a secret message to Alice? Bob must encrypt the message with his public key and Alice will decrypt with Bob’s private keyBob must encrypt the message with his private key and Alice decrypts it with Bob’s public key.Bob must encrypt the message with Alice’s private key and Alice decrypts it with her public key.Bob must encrypt the message with Alice’s public key and Alice decrypts it with her own private key.

A person wants to send a message would request the recipient’s digital certificate which contains ________ key from a trusted directory and use it to encrypt the message before  sending. Once the message is encrypted, it can only be decrypted using the intended  recipient’s _______ key. What are the keys used in the statement above respectively? Select one:a.private, publicb.public, privatec.public, publicd.private, private