Confidentiality - which assures that information will be kept secret, with access limited to appropriate individuals. Confidentiality keeps sensitive information private. Integrity - which protects information from being modified, destroyed or otherwise corrupted, either maliciously or accidentally. Message integrity refers to messages not being modified while in transit. File integrity refers to files not being modified while in storage.
Integrity ensures that information is unchanged from the point of origin to the point of delivery.
If data are altered, integrity allows the transaction or information to be voided. Proof of the integrity and origin of data can be verified by a third party at any time. This term collectively describes all the parts of a security structure that enable electronic commerce and file exchange over the open public network. PKI is used today for virtually all secure Web transactions and for most Internet EDI exchanges. It is heavily based on X.500 and X.509 standards for Public Key Certificates and Directory Services.