Service integrity is the reliable and consistent functioning of a digital public service. It means the service continues to deliver correct records, predictable workflows, and steady access even when many users, offices, or systems depend on it at once.
In cyber security, service integrity matters because public services are high-trust targets: if data is altered, releases are broken, or support processes fail, citizens may receive wrong outcomes or face delays. Attackers may try to damage integrity through unauthorized changes, tampering, credential abuse, or supply-chain compromise. Defenders protect it with strong change control, versioning, testing, access restrictions, logging, rollback plans, and clear operational procedures. In shared government platforms, integrity is not only a software issue; it also depends on coordination, documentation, and disciplined deployment.