cloud security: Azure Key Vault

Key Vault | Microsoft Azure

"With Azure Key Vault, you can encrypt keys and small secrets like passwords using keys stored in hardware security modules (HSMs). For added assurance, you can import or generate keys in HSMs. If you choose to do this, Microsoft will process your keys in FIPS 140-2 Level 2 validated HSMs (hardware and firmware). Key Vault is designed so that Microsoft does not see or extract your keys."

Client-Side Encryption with .NET for Microsoft Azure Storage | Microsoft Azure