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You can use TLS/SSL (Transport Layer Security/Secure Sockets Layer) to encrypt all of MongoDB’s network traffic. TLS/SSL ensures that MongoDB network traffic is only readable by the intended client.
See Transport Encryption for more information.
Encryption at Rest¶
There are two broad classes of approaches to encrypting data at rest with MongoDB: Application Level Encryption and Storage Encryption. You can use these solutions together or independently.
New in version 3.2: MongoDB Enterprise 3.2 introduces a native encryption option for the WiredTiger storage engine. This feature allows MongoDB to encrypt data files such that only parties with the decryption key can decode and read the data.
See Encryption at Rest for more information.