Reference Glossary
Encryption at rest
Asset files and metadata stored on disk and in backups in encrypted form, unreadable without the decryption key even if the underlying storage medium is accessed directly.
Why it matters in a DAM
Encryption at rest protects the archive if a physical drive is stolen, a backup tape is lost, or a cloud storage bucket is misconfigured to allow unintended access — the data on disk remains unreadable without the key even when the storage itself is compromised. It's also legally relevant for regulated content: under HIPAA's breach notification safe harbor, a breach of properly encrypted PHI generally does not trigger the same notification obligations as a breach of unencrypted data, which is one concrete reason healthcare and life-sciences DAM customers push specifically for encryption at rest, not just general security assurances.
A worked example
Common mistake
Relying on a storage provider's default encryption ("our cloud provider encrypts everything") without knowing who actually holds the decryption keys — vendor-managed keys mean the vendor, and anyone who compromises the vendor's own systems, can still decrypt the data, which matters for regulated customers who specifically require customer-managed keys.
Encryption at rest means the asset files and their metadata are stored on disk, and in backups, in an encrypted form that’s unreadable without the corresponding decryption key — a protection that holds even if someone gains direct access to the storage medium itself, whether that’s a stolen physical drive or a cloud storage bucket exposed by a misconfiguration. Standard practice is AES-256 encryption applied uniformly across the storage layer.
The regulatory angle worth knowing is that for HIPAA specifically, properly encrypted Protected Health Information generally falls under a breach notification safe harbor: if PHI is encrypted to the standard specified by HHS guidance and the encryption key wasn’t also compromised, a security incident involving that data may not trigger the same notification obligations as a breach of unencrypted PHI. That’s a concrete, practical reason healthcare-adjacent DAM customers ask specifically about encryption at rest rather than accepting general security assurances.
The detail that gets glossed over in vendor evaluations is key management: knowing that data is encrypted at rest answers less than knowing who holds the keys. Vendor-managed keys mean the vendor’s own systems and staff, or anyone who compromises them, retain the ability to decrypt customer data — encryption at rest doesn’t protect against the vendor itself as a risk. Customer-managed or customer-supplied key options close that gap, and it’s specifically the kind of detail regulated customers should confirm rather than assume from a generic “encrypted” claim.
Frequently asked
What does encryption at rest actually protect against?
It protects the archive if a physical drive is stolen, a backup tape is lost, or a cloud storage bucket is misconfigured — the data stays unreadable without the key even when storage is compromised.
How does encryption at rest relate to HIPAA breach notification?
Under HIPAA's breach notification safe harbor, a breach of properly encrypted PHI generally doesn't trigger the same notification obligations as a breach of unencrypted data.
What's the standard encryption method used at rest?
AES-256 encryption applied uniformly across the storage layer is standard practice.
What detail do vendor evaluations often overlook about encryption at rest?
Who actually holds the decryption keys — vendor-managed keys mean the vendor itself, or anyone who compromises the vendor's systems, can still decrypt the data.
What's the alternative to vendor-managed keys?
Customer-managed or customer-supplied key options, which close the gap where encryption at rest doesn't protect against the vendor itself as a risk.
Why do healthcare and life-sciences DAM customers specifically ask about encryption at rest?
Because it's a concrete, practical route to the HIPAA breach notification safe harbor, rather than accepting a general "we're secure" assurance.