Data integrity, in terms of data and network security, is the assurance that information can only be accessed or modified by those authorized to do so.

Measures taken to ensure integrity include controlling the physical environment of networked terminals and servers, restricting access to data, and maintaining rigorous authentication practices. Data integrity can also be threatened by environmental hazards, such as heat, dust, and electrical surges. Practices followed to protect data integrity in the physical environment include: making servers accessible only to network administrators, keeping transmission media (such as cables and connectors) covered and protected to ensure that they cannot be tapped, and protecting hardware and storage media from power surges, electrostatic discharges, and magnetism. Network administration measures to ensure data integrity include: maintaining current authorization levels for all users, documenting system administration procedures, parameters, and maintenance activities, and creating disaster recovery plans for occurrences such as power outages, server failure, and virus attacks.