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Case Studies

Encrypted Remote Blob Storage

Townsend Security, Inc. is a leading data encryption and key management solutions provider. For more than 20 years, Townsend has helped companies achieve security compliance requirements with solutions including encryption and tokenizing, encryption key management, communications security, system logging, and other professional security solutions. Townsend’s security solutions are NIST certified and meet up-to-date standards in HIPAA, PCI, and HITECH for encryption and key management requirements.


Microsoft SharePoint 2010 supports the use of SQL Server Enterprise Edition with Encryption Key Management and Transparent Data Encryption for encrypting database content. However, many of Townsend’s clients use Remote Blob Storage (RBS) because of its reliable performance and ability to overcome size limitations by removing the need to store blobs directly to the SQL Server. Documents stored in RBS are not encrypted by the SQL Server and RBS does not provide any encryption and decryption functions by default. Therefore, Townsend needed a custom solution that would provide encryption and decryption functions with RBS for SharePoint 2010 clients.


Townsend sought the assistance of AllianceTek, who used its R&D and Microsoft-certified professionals for SharePoint development to create an innovative solution for Townsend. The solution includes a custom SharePoint RBS application that incorporated Townsend’s existing encryption key retrieval library to encrypt documents stored in RBS and decrypt retrieved documents.


AllianceTek achieved RBS encryption by extending the RBS class to create a new custom RBS provider that encrypts and decrypts documents. This allows Townsend’s clients to benefit from the larger size limitations of RBS with the enhanced security and functionalities that exist with SharePoint.


With AllianceTek’s solution, users can securely access, store, and manage documents using their existing SharePoint system. This improved the speed and ease of operations with a reliable encryption and decryption process through the custom RBS application. This application fully integrates with existing SharePoint and RBS systems to provide a unique and secure solution to implement RBS with encryption and decryption functionalities.

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