Information assurance (IA) is the practice of protecting against and managing risk related to the use, storage and transmission of data and information systems. Information assurance processes typically ensure the following functions for data and associated information systems:
Availability ensures information is ready for use by those that are allowed to access it and at a required level of performance.
Integrity ensures that information and associated systems can only be accessed or modified by those authorized to do so.
Non-repudiation ensures that someone cannot deny an action, such as the receipt of a message or the authenticity of a statement or contract, because the system provides proof of the action.