The automatic feature of field level encryption is only available in MongoDB Enterprise 4.2 or later, and MongoDB Atlas 4.2 or later clusters.
mongocryptd is required for automatic field level encryption and is included as a component in
the MongoDB Enterprise Server package, or separately as the
- Parses the automatic encryption rules specified to the database
connection. Automatic encryption rules use a strict subset of
JSON schema syntax. If the automatic encryption rules contains invalid
automatic encryption syntax or any
mongocryptdreturns an error.
- Uses the specified automatic encryption rules to mark fields in read and write operations for encryption.
- Reject read/write operations that may return unexpected or incorrect results when applied to an encrypted field. See Read/Write Support with Automatic Field Level Encryption for more information.
mongocryptd is only responsible for the above functions, and does
not perform any of the following:
mongocryptddoes not perform encryption or decryption itself
mongocryptddoes not access any encryption key material
mongocryptddoes not listen over the network
Drivers compatible with MongoDB 4.2 and later use the Apache-licensed libmongocrypt library for performing client-side field level encryption and automatic decryption.
The official MongoDB 4.2+ compatible drivers,
and the 4.2 or later legacy
mongo shell require access to
mongocryptd process on the client host machine. These clients
search for the
mongocryptd process in the system PATH by default.
See Installation for the complete documentation on
If the 4.2+ compatible driver has access to the
by default the driver manages the spawning of the
process. The 4.2+ compatible drivers may have additional options for
specifying the path to or the spawning behavior of the
If possible, we recommend that
mongocryptd be started on boot,
rather than launched on demand.
For supported Linux Operating Systems, follow the documented
installation instructions and install the
package. Alternatively, specify
mongodb-enterprise-cryptd instead to
install only the
mongocryptd binary. The package manager installs
the binaries to a location in the system PATH (e.g.
For OSX, install the Server package. The package manager installs binaries to a location in the system PATH.
For Windows, install the
You must add the
mongocryptd package to your system PATH after
installation. Defer to documented best practices for your Windows
installation for instructions on adding the
mongocryptd binary to
the system PATH.
For installations via an official tarball or ZIP archive,
follow the documented best practices for your operating system to add
mongocryptd binary to your system PATH.