If your computer is encrypted and you forget the password that unlocks your hard drive, you'll need the encryption recovery key to unlock your drive. In most cases, Stanford users have their recovery keys backed up in a secure database by the university. The recovery key can then be retrieved in MyDevices.
Due to a bug that has now been fixed, some recovery keys that were saved using the Stanford Whole Disk Encryption (SWDE) service cannot be retrieved in MyDevices. You can check to see if any device belonging to you has a key available for retrieval in MyDevices.
If your device is encrypted but your encryption recovery key cannot be retrieved in MyDevices, you can use the Key Escrow Tool to fix the problem.