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What does “no longer secure” mean for your system?
An algorithm being weakened, a flaw in one library implementation, and a component reaching end of support are different problems. They can affect different versions, configurations, and uses. A weakness in one use of an algorithm does not automatically establish that every use of it is equally exposed.
Before changing anything, identify the specific cryptographic function involved: encryption, key establishment, digital signatures, hashing, key wrapping, or another use. Record the algorithm and parameters, library and version, protocol or product, and affected configuration. Check the relevant maintainer or vendor advisory, downstream dependency notices, and authoritative standards or regulatory guidance for your deployment. Note the advisory date, affected versions, exploitability, and any required transition deadline.
NIST SP 800-131A Rev. 2 is a transition reference for stronger cryptographic keys and more robust algorithms; NIST’s publication page lists Rev. 3 as an initial public draft, not a final replacement. The applicable standard or deadline may differ by system, sector, and jurisdiction.
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How do you find every affected use?
Build an inventory before making a broad change. Cryptographic dependencies can live in application code, configuration, operating systems, managed platforms, devices, protocols, databases, backups, and external services—not just in a library explicitly named in a source file.
- For each use, record its purpose, implementation and version, algorithm and parameters, key or certificate identifier, dependent clients and services, and the data or trust it protects.
- Assign an owner and document the supported upgrade or migration route, compatibility constraints, and blockers.
- Include data at rest and in transit, stored ciphertext, key-encryption and data-encryption keys, certificates, and signed artifacts where relevant.
- Do not put secret key material in the inventory. Record identifiers and locations, not the secrets themselves.
OWASP’s post-quantum migration guidance likewise emphasizes identifying dependencies, assigning ownership, and recording migration paths. Prioritize systems holding sensitive information that must remain confidential for years, as well as systems that will be difficult to update later.
What should you change first?
Contain new use of the affected configuration
Decide whether the advisory, threat assessment, or applicable policy requires you to stop creating new ciphertext, signatures, or connections with the affected configuration immediately. Where required, move new operations to a supported and suitable implementation. Do not assume that changing an interface or adding a wrapper fixes the problem if the vulnerable operation still protects new data or traffic.
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Plan the migration of existing uses separately
Changing what protects new operations is not the same as migrating stored data, existing keys, certificates, or signed artifacts. Those tasks have distinct compatibility and recovery consequences. Set a migration route for each affected use rather than treating “upgrade the library” as the complete plan.
What should you do with existing ciphertext and keys?
For stored ciphertext, re-encrypting under the replacement algorithm and keys is generally preferable when practical. It gives the application and key-management process a cleaner end state. If bulk re-encryption is not feasible, use an explicit, controlled legacy-decryption policy: retain the old decryption keys as needed, identify which data requires them, and document when that dependency will end. OWASP’s storage guidance discusses both approaches and notes the trade-offs.
| Approach | When it may fit | What to plan for |
|---|---|---|
| Decrypt and re-encrypt stored data | When the data can be migrated safely and the required processing is practical. | Migration capacity, application compatibility, key handling, validation, and recovery if the migration is interrupted. |
| Keep controlled legacy decryption | When re-encryption is not practical or some data must remain in its existing form temporarily. | Explicit key identifiers, restricted access to old keys, a clear scope and owner, and a defined retirement condition for the legacy path. |
Keep old keys available for as long as they are needed to decrypt retained data and recover old backups. Test restoration and key recovery before retiring or destroying them. A key that is no longer used for new encryption may still be essential for recovery.
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Distinguish data-encryption-key migration from key-encryption-key rotation. OWASP’s Key Management Cheat Sheet describes re-wrapping stored data-encryption keys under a replacement key-encryption key before retiring the old wrapping key. Re-wrapping keys is not the same operation as decrypting and re-encrypting the protected data.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How should you choose a replacement?
There is no universally correct replacement that can be named from the fact that an algorithm or library is deprecated. Choose according to the cryptographic purpose and the system’s constraints. Compare candidates by their security properties and strength, standards or regulatory acceptance, maturity, implementation quality, interoperability, performance, and support across dependent platforms and libraries.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteUse maintained, supported implementations rather than custom cryptographic algorithms. OWASP recommends authenticated modes where available for symmetric encryption and discusses AES with secure modes in its storage guidance. Those are general recommendations, not a substitute for checking the system’s specific use, threat model, compatibility needs, or compliance obligations.
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How do you test and deploy the migration safely?
- Test representative cases. Verify old ciphertext can be migrated or decrypted as planned; test key migration, relevant signed artifacts, interoperability, and error handling.
- Test recovery. Restore representative backups and exercise key recovery before retiring old keys or changing production access paths.
- Roll out in stages. Begin with a limited set of services or clients, monitor negotiation, migration failures, and compatibility, then expand as results permit.
- Protect against silent fallback. Where policy requires the replacement protection, ensure errors do not quietly downgrade to the affected configuration.
- Bound exceptions. Give each temporary fallback an owner, a defined scope, and an expiry date or measurable retirement criteria. Remove it after the required paths have migrated.
OWASP’s post-quantum migration guidance recommends testing recovery, using staged rollout, maintaining a rollback plan, and removing temporary exceptions after migration. Monitoring should reveal failures without logging secret keys or other sensitive material.
How can you make the next cryptographic change easier?
Design systems so cryptographic choices can be adapted without a major redesign. NIST defines crypto agility as the capability to replace and adapt cryptographic algorithms across protocols, applications, libraries, software, hardware, firmware, and infrastructure while preserving security and ongoing operations. NIST published this definition in CSWP 39-upd1 on December 19, 2025.
In practice, that means maintaining the inventory and ownership records, making algorithm and version choices configurable where appropriate, coordinating with suppliers and dependent services, and keeping migration and recovery procedures tested. NIST notes that cryptographic transitions can be costly and time-consuming, create interoperability problems, and disrupt operations; planning those paths in advance reduces the chance that a future change becomes an emergency redesign.
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