Providing content trust of the image supply chain is one of the most important, but often neglected, topics in managing Docker images. In any distributed system that communicates and transfers data over an untrusted medium (such as the internet), it is crucial to provide a means of content trust – a way of verifying both the source (publisher) and the integrity of data entering the system. For Docker, this is especially true for pushing and pulling images (data), which is performed by Docker Engine.
The Docker ecosystem describes the concept of Docker Content Trust (DCT), which provides a means of verifying the digital signatures of data being transferred between the Docker Engine and the Docker Registry. This verification allows the publishers to sign their images and the consumer (Docker Engine) to verify the signatures...
