Tang is a network-based data binding server that provides location-dependent data access control. The system operates by making encrypted data available only when the client system is connected to a specific network where the Tang server is accessible. The tool functions through an asymmetric key-based encryption process. Tang servers advertise their public keys to clients on the network. Clients retrieve these advertised keys and use them to generate unique encryption keys for securing their data. After encrypting the data, clients discard the encryption key locally. When clients need to decrypt their data, they must be on the same network as the Tang server to perform an HTTP POST request that recovers the encryption key. This network-presence requirement ensures that data remains inaccessible when systems are removed from the designated network environment. Tang serves as an alternative to traditional key escrow systems by eliminating the need for centralized key storage while maintaining secure access control based on network location.