Encrypted Key-value Database Using Homomorphic Encryption

The text details the development of an encrypted key-value database using Fully Homomorphic Encryption (FHE) as part of the Zama Bounty Program, successfully completed by a GitHub user named Alpaylan. This database aims to securely store and retrieve data without decryption, thus eliminating security concerns in cloud-based or large open environments. The tutorial covers the creation of a database that supports three main operations—insert, replace, and query—implemented as FHE circuits. It distinguishes between static and dynamic implementations, with the former being more efficient for dense databases through parallelized processing, and the latter being more suitable for sparse databases due to its flexibility in growing as needed. The text includes detailed explanations of the circuit functions, state configuration, and database interface, showcasing the potential of FHE in maintaining data confidentiality in various applications, such as online shopping carts and session stores. The document encourages further exploration by providing code examples and inviting participation in the Zama Bounty Program.