eCustodian is a flexible and cost-effective system for managing the production, distribution, and inventory control of cryptographic materials. It serves as a self-contained, nationwide Crypto Management System, supporting the planning, accounting, and distribution of crypto keys and materials in compliance with NATO standards (SDIP-293). The system enables the assignment of crypto material, movement between accounts, and automatic generation, distribution, and accounting of electronic crypto keys, ensuring efficient and reliable crypto management.