Securing TLS 1.3 Session Ticket Encryption Keys (STEK) in Hardware

Engineering centralized hardware key vaults to securely synchronize and rotate session ticket encryption keys across distributed CDN edges.

The Vulnerability of Session Ticket Encryption Keys (STEK)

In high-traffic CDNs, TLS session resumption (RFC 5077) is critical for performance. However, if the Session Ticket Encryption Key (STEK) is compromised, an attacker can retroactively decrypt all resumed TLS sessions across all servers sharing that key. NetworkHSM stores and rotates STEK keys inside certified hardware enclaves, guaranteeing perfect forward secrecy.

Hitless Global Synchronization

NetworkHSM synchronizes STEK keys across hundreds of edge datacenters via encrypted mTLS meshes, utilizing dual-active key slots so that incoming tickets encrypted with previous keys remain valid during rotation windows.

0-RTT Resumption Protection: Mitigating replay attacks on early data during 0-RTT session resumption.
Automated Global STEK Rotation: Synchronizing ephemeral session keys across global CDN PoPs every 60 minutes.
Forward Secrecy Enforcement: Erasing expired STEK keys from hardware memory to preserve perfect forward secrecy.
Zero Plaintext Exposure: Decrypting and validating session tickets entirely inside hardware enclave registers.

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