Encryption in transit

AWS IoT Greengrass has two modes of communication where data is in transit:

Data in transit over the internet

AWS IoT Greengrass uses Transport Layer Security (TLS) to encrypt all communication over the internet. All data sent to the AWS Cloud is sent over a TLS connection using MQTT or HTTPS protocols, so it is secure by default. AWS IoT Greengrass uses the AWS IoT transport security model. For more information, see Transport security in the AWS IoT Core Developer Guide.

Data on the core device

AWS IoT Greengrass doesn't encrypt data exchanged locally on the Greengrass core device because the data doesn't leave the device. This includes communication between user-defined components, the AWS IoT device SDK, and public components, such as stream manager.