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Target customers: enterprise users of Alibaba Cloud Container Service for Kubernetes (ACK) and Container Registry that require high security. Feature released: Container Registry Enterprise Edition supports container image signing. This prevents man-in-the-middle (MITM) attacks, and also prevents updates and deployments of illegal images. This way, image consistency and security from distribution to deployment is guaranteed. You can enable automatic image signing for images in a specified namespace. Each time you push a container image, the image is signed based on signing rules. After the image is signed, the image becomes a trusted container image.