AI-Powered Discovery in a Fully Disconnected Environment

A government department required urgent access to sensitive documents stored offline in support of legal investigations. With approximately 200,000 records held on external media and strict access restrictions in place, Castlepoint was engaged to provide secure, offline classification and discovery using artificial intelligence. The result was complete oversight and policy-aligned governance of high-risk information without needing to move content into a networked environment.

The Challenge

The department held a significant volume of sensitive material related to a high-profile legal matter. Due to the classified nature of the content, the data could not be transferred to or stored on any networked systems. The agency needed a solution that could index, classify and manage these documents on an encrypted external drive, while maintaining strict physical security and access controls.

The Solution

Castlepoint was deployed on a secure standalone machine, interfacing directly with the 1TB USB drive in an air-gapped room. File names were obfuscated, and classification was performed using the content of the files, not metadata. Castlepoint automatically applied relevant records disposal schedules, case-specific ontologies and policies, and flagged items containing personal, health or national security information for specific handling. All processing was completed under supervision, with training provided on a separate environment.

The solution provided:

  • Secure, air-gapped implementation for offline content
  • Classification of encrypted documents using Explainable AI
  • Matching against 79 internal and regulatory policies
  • Discovery and governance of high-risk, classified content
  • Identification of personal, health and security-related data
  • Full audit trail, monitoring and supervised access
  • AI-powered disposal and lifecycle management

The Outcome

Castlepoint enabled the department to fully govern 200,000 previously inaccessible documents without compromising their sensitivity or security. High-value and high-risk records were surfaced, classified and made discoverable for legal and operational use, while ensuring auditability and compliance. Sensitive information was handled according to its risk profile, without moving or duplicating files.

Key results included:

  • 200,000 documents governed in an offline environment
  • 79 policies matched automatically to content
  • 2 million key phrases extracted from encrypted files
We will always commit to providing whole-of-life management of any content, no matter what it is or where it lives.
Rachael Greaves, Castlepoint CEO

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