From IBM, we have this: -
Ensure the confidentiality of data and code in container images
Ensure the confidentiality of data and code in container images
This article addresses a remaining security concern for enterprises about the confidentiality of data and code in container images. The primary goal for container image security is to allow the building and distribution of encrypted container images for making them only available to a set of recipients. While others might be able to access these images, they cannot run them or see the confidential data inside them. Container encryption builds on existing cryptography such as Rivest–Shamir–Adleman (RSA), elliptic curve, and Advanced Encryption Standard (AES) encryption technologies.