Secure storage is the persistence of data with protections for confidentiality, integrity, and controlled access throughout its lifecycle. It combines encryption at rest, access control, tamper-evidence, and key management, sometimes anchored in hardware security modules or trusted execution environments. It is essential where stored records must remain trustworthy, such as audit trails and chains of custody.
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- Implementations layer encryption at rest with robust key management, fine-grained access control, and integrity mechanisms such as hashing or append-only logs. Where non-repudiation matters, write-once media, cryptographic timestamping, or hardware-backed keys provide tamper-evidence that supports legal and compliance use.