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🔐 '''Encryption at rest''' refers to the cryptographic protection of data while it is stored on a physical or virtual medium — such as a database, file system, or backup tape — rather than while it is being transmitted across a network. In the insurance industry, where vast repositories of [[Definition:Personally identifiable information (PII) | personally identifiable information]], health records, financial data, and [[Definition:Claims | claims]] histories reside in [[Definition:Policy administration system (PAS) | policy administration systems]], [[Definition:Data warehouse | data warehouses]], and [[Definition:Cloud computing | cloud]] storage, encryption at rest is a foundational layer of [[Definition:Information security | information security]]. Regulators across multiple jurisdictions — from U.S. state insurance departments enforcing the NAIC Insurance Data Security Model Law to the European Union's General Data Protection Regulation (GDPR) and Singapore's Personal Data Protection Act — increasingly expect or mandate that sensitive policyholder data be encrypted when stored.

⚙️ The mechanism typically involves applying symmetric encryption algorithms (such as AES-256) to data as it is written to disk, rendering it unreadable without the correct decryption key. Insurance organizations implement this at various levels: full-disk encryption on employee laptops and workstations, column-level encryption within relational databases holding [[Definition:Underwriting | underwriting]] and claims data, or transparent data encryption (TDE) offered by database platforms. Key management is the critical operational challenge — insurers must ensure that encryption keys are stored separately from the encrypted data, rotated on a defined schedule, and protected by robust access controls. Many [[Definition:Insurtech | insurtech]] firms and large carriers rely on hardware security modules (HSMs) or cloud-provider key management services to handle this responsibility, with audit trails that satisfy [[Definition:Regulatory compliance | regulatory compliance]] examinations.

🛡️ A breach that exposes encrypted-at-rest data is materially different — legally, financially, and reputationally — from one that exposes plaintext records. Several data breach notification regimes, including those under U.S. state laws and the GDPR, include safe-harbor provisions that reduce or eliminate notification obligations when compromised data was properly encrypted. For insurers, this directly affects [[Definition:Cyber insurance | cyber insurance]] exposure calculations as well as their own risk posture: an insurer writing cyber policies must understand encryption at rest both as a control it evaluates in prospective [[Definition:Insured | insureds]] and as a practice it enforces internally. As the volume of digitized insurance records grows — driven by [[Definition:Digital transformation | digital transformation]], [[Definition:Telematics | telematics]] data ingestion, and [[Definition:Artificial intelligence (AI) | AI]]-powered analytics — encryption at rest has moved from a best practice to a baseline expectation across the global insurance ecosystem.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Encryption in transit]]
* [[Definition:Cyber insurance]]
* [[Definition:Information security]]
* [[Definition:Cloud computing]]
* [[Definition:Regulatory compliance]]
* [[Definition:Data privacy]]
{{Div col end}}

Definition:Encryption at rest - Revision history

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