MongoDB 3.2 introduces a new option for at-rest data encryption, providing enhanced security for sensitive data stored in databases. The new Encrypted Storage Engine offers improved performance characteristics compared to previous methods of encrypting data-at-rest, with an average throughput overhead of 10-20% and latency overheads ranging from 5-30%. This solution mitigates the risks associated with disk and file system encryption alone by adding a database layer of security. The engine supports various encryption algorithms and provides secure management of encryption keys, ensuring optimal performance while protecting sensitive data. MongoDB Atlas, a database as a service, offers additional features for encrypting data-in-flight over the network and at rest on disk, providing an easy-to-use solution for developers to focus on their applications rather than managing key infrastructure.