Explanation: Explanations:those 3 are the pillars of network security, with Encryption you can make the information visible only to the parties involved (the ones that have the decryption keys), everyone else will only see garbage, this provides privacy. With authentication you can validate that an entity is really it, authentication can be provided with something you have, something you know, or a combination of both. And with Integrity, you can validate that the information has not changed from source to destination, this could be achieved with the use of Digital Signatures. The best security is achieved with a combination of the 3.