AWS Database Encryption SDK for Amazon DynamoDB In Preview

 AWS Database Encryption SDK is an upgrade to the existing Amazon DynamoDB Encryption Client, that enables attribute level encryption of DynamoDB workloads client-side.

DynamoDB has always had server-side encryption to ensure your data was encrypted at rest. This new SDK enables client- side encryption too, allowing you to protect the data in transit before it even leaves its origin. Previously, if you wanted client-side encryption you had to provision your own solution in your applications. With the SDK that's a thing of the past.

https://www.i-programmer.info/news/87-web-development/16473-aws-database-encryption-sdk-for-amazon-dynamodb-in-preview.html