How is data in SQL Azure secured?

All of our SQL Azure databases use TDE (transparent data encryption). TDE help protect against the threat of malicious offline activity by encrypting data at rest. It performs real-time encryption and decryption of the database, associated backups, and transaction log files at rest without requiring changes to the application. More in-depth information about TDE can be found at:

https://docs.microsoft.com/en-us/azure/sql-database/transparent-data-encryption-azure-sql.