Microsoft Azure Confidential Computing – a Step Forward in Cloud Security

A few days ago, Microsoft announced Azure Confidential Computing. As the name implies, the technology is about adding a new layer of protection to cloud services, specifically Microsoft Azure, but also Windows 10 and Windows Server 2016 running in other public cloud infrastructures on specific hardware.

The foundation for Azure Confidential Computing are so-called TEEs (Trusted Execution Environments). Such environments protect the code running in that environment and data used by the code from other parties’ access. Neither administrators, neither people having direct access to hardware, nor attackers that gain access to administrator accounts can bypass that protection layer – at least this is what the TEE concept promises.

Based on TEEs, data can be held encrypted in the cloud services and their data stores and are only decrypted and processed within the TEE. That means that data is not always encrypted, but it remains – if the application is implemented correctly – encrypted in the accessible areas of the public cloud.

For now, there are two supported TEEs. One is Virtual Secure Mode, a software-based TEE that is based on Microsoft Hyper-V in Windows 10 and Windows Server 2016. The other is Intel SGX (Software Guard Extensions), which is a hardware-based TEE. Based on Intel SGX, secure TEEs can be used outside of the Microsoft Azure Cloud.

Microsoft has been using such technologies as part of their Coco Framework for enterprise blockchain networks for some weeks already, and now is moving support to Microsoft SQL Server and Azure SQL Database. This is achieved by delegating computations on sensitive data to an “enclave”, which is based on a TEE. However, Azure Confidential Computing supports broader use of this capability for various types of data.

Microsoft Azure Confidential Computing, which is available in an early adopter’s program, is a great improvement for security and confidentiality in public cloud environments and will enable customers to port workloads to the cloud which, so far, have been considered as being too sensitive. The announcement stands in line with the recent IBM announcement for their IBM Z14 systems, where factually the entire system acts as a TEE. While the use of TEEs in Azure Confidential Computing is restricted to parts of the application that are moved to the TEE specifically, both announcements are about significantly increasing the level of security in computing. That is good news.


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