[Availability update | July 28th, 2020 | Microsoft Lists began roll out to Targeted Release (TR) customers in Microsoft 365, planned TR completion by end of August 2020 where we'll then begin broader production roll out - more availability insight in the FAQs section below] Microsoft shares the responsibility of data protection with you by instantiating the availability key and taking extensive measures to protect it. The first one to finish furnishes the result, canceling the other request. Microsoft 365 does not generate customer-visible logs for this activity. The availability key wraps the keys one tier lower in the key hierarchy. As of today, Customer Key is involved in the encryption and decryption chain of SharePoint Online file data stored in the Azure blob store, but not SharePoint Online list items or metadata stored in the SQL Database. If the examination determines that the requests failed returning ACCESS DENIED: This means deliberate, inadvertent, or malicious action has been taken to render the customer keys unavailable (for example, during the data purge process as part of leaving the service). The TIK is then used to encrypt site keys, which are then used to encrypt blob keys (also called file chunk keys). An audit log record for the availability key operation is generated each time the service uses the availability key. The availability key provides a recovery, "break-glass" capability if control over both Azure Key Vault keys is lost. All service teams upload their logs to a central repository where the logs are aggregated and processed. If you are using Office 365 operated by 21Vianet, see the 21Vianet Trust Center. For more information about how Microsoft protects your data, see Office 365 Trust Center. The primary purpose of the availability key is to provide recovery capability from the unanticipated loss of root keys that you manage. Microsoft employs a defense-in-depth strategy to prevent malicious actors from impacting the confidentiality, integrity, or availability of customer data stored in the Microsoft Cloud. Decrypting the TIKs extends the lifetime of the cache. Microsoft 365 Home ; Products. Collaborate for free with online versions of Microsoft Word, PowerPoint, Excel, and OneNote. For SharePoint Online, OneDrive for Business, and Teams files, the availability key is only activated by Microsoft, when instructed by you, for recovery purposes. In this case, the availability key will be used only for system actions and not for user actions, the user request fails, and the user receives an error message. These services initiate automated operations that never involve direct access to the availability key. A new record type called "Customer Key Service Encryption" with activity type "Fallback to Availability Key" allows admins to filter Unified Audit Log search results to view availability key records. Lockbox ensures access is time bound with automatic access revocation upon time expiration or engineer log out. You'll use the availability key to migrate to a new Data Encryption Policy with new root keys you provision. Use the decrypted Mailbox Key to decrypt the mailbox itself, allowing you to access the data within the mailbox. For SharePoint Online, OneDrive for Business, and Teams files, the availability key is NEVER used outside of the recovery capability.
In case you lose access to your customer keys, Microsoft 365 also encrypts the TIK with an availability key and stores this along with the TIKs encrypted with each customer key.
Unlike the keys that you provide and manage in Azure Key Vault, you can't directly access the availability key. The service encrypts the DEP Key three times: once with each of the customer keys and once with the availability key. Microsoft engineers don't have direct access to the availability key secret stores.
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