Decryption Key Decay: The Quiet Kill Zone Your Backup Policy Ignores
Here's a scene that plays out more often than anyone in data protection likes to admit. A sysadmin, maybe you, maybe a colleague, reaches for an old backup to restore a database that just went sideways. The tape mounts, the drive spins, the software asks for the decrypal key. And then silence. The key is somewhere—on a sticky note from 2018, in a password manager that's since been decommissioned, or encoded in a file that nobody can remember the passphrase for. The backup is technically intact. But it might as well be a brick. That's key decay. Not the gradual wearing down of metal or silicon, but the gradual, invisible erosion of your ability to unlock what you saved. It's the quiet kill zone your backup policy ignores, as most policie stop at 'we encrypt everything' and rare think about what happens when the key itself becomes the limiter.