Master Key

Definitions

1. A high-value cryptographic key used to protect, derive, or wrap other keys rather than directly encrypting ordinary application data. Because many lower-level secrets depend on it, compromise of a master key can have system-wide consequences.

   In plain English: A top-level cryptographic key used to protect other keys.

   Example: "The design kept short-lived data keys separate, but everything still depended on the HSM-protected master key."

Related Terms

• Encryption Key Management
• Envelope Encryption
• Ephemeral Key
• Hardware Security Module
• Key Ceremony
• Key Derivation
• Key Escrow
• Key Exchange
• Root Key