Alice and Bob are using a digital signature to sign a document. What key should Alice use to sign the document so that Bob can make sure that the document came from Alice?Question 6Select one:username and password from Aliceprivate key from Bobpublic key from Bobprivate key from Alice

What technology should you implement to ensure that an individual cannot later claim that he or she did not sign a given document?Select one:digital signatureasymmetric encryptionHMACdigital certificat

Bob wants to sign his message to Mary so that she knows it is actually Bob who is the originator and not someone else. 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 signatureBBob uses Mary's private key to encrypt so the Mary can use her public key to decrypt the signatureCBob uses his private key to encrypt so the Mary can use Bob's public key to decrypt the signatureDBob uses his public key to encrypt so the Mary can use Bob's private key to decrypt the signature

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

explain digital signature and pki

How many key signatures are there?