SECURITY Signal 70
Four patterns enable post-quantum cryptography in Spring Boot applications
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The article describes four practical patterns for adding post-quantum cryptography to Spring Boot services, including payload encryption, database field protection, long-lived document signing, and quantum-safe OAuth2 tokens.
Engineers face an active Harvest Now, Decrypt Later threat where adversaries store current RSA-protected traffic to decrypt once quantum computers are available. Long-lived assets such as loan agreements and KYC records will become forgeable around 2035, creating legal liabilities that cannot be fixed after the fact. Adopting the outlined patterns lets teams protect data now without waiting for cloud-provider PQC TLS rollout.
Written by elseif from the cluster below · every claim links back to a sourceThe three things worth knowing
Using JDK 24 enables ML-KEM and ML-DSA via the standard JCE API, removing the need for extra libraries to start PQC work.
Encrypting database fields with Kyber keys is straightforward, but the key must be kept out of the JVM heap via KMS or Vault integration before production deployment.
Long-lived documents signed with RSA today will have forgeable signatures around 2035, so migration should prioritize those assets over short-lived session tokens.
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