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The deal between Budapest Stock Exchange and the Vienna Bourse. The library also supports integration with Azure Key Vault for storage account key management. The KEK is identified by a key identifier and can be an asymmetric key pair or a symmetric key and can be managed locally or stored in Azure Key Vaults. The library invokes the key wrapping algorithm that is provided by Key Vault. The wrapped key along with some additional encryption metadata is either stored as metadata (on a blob) or interpolated with the encrypted data (queue messages and table entities).