Roles of Docker Content Trust (DCT) Keys
Image Signing process
when you docker image is signed with the keys then the private key which is connected with your repository is utilized and further create a cryptographic code for that image. This code signature work as an unique identifier which concern that the image comes from the authentic source and it is trustworthy.
Image Verification
DCT client uses the public key which is connected with the docker repository which is used for verifying the key is match with unique signature of the DCT image when we are pulling or working on the Docker image. This verification process make sure that the image has not been having malicious activities. and follows the security rules.
Trust on First Use (TOFU)
DCT is working on the model called “Trust on first use” the public key is obtained and cached the first time an image from a particular repository is encountered. furthermore this cached key is applied to more verifications. by using this technique DCT knows the image is in use or not and easily keep tracks on the suspicious activities which gradually enhancing the reliability of the Docker images
How to Use Docker Content Trust to Verify Docker Container Images
The world of containerized applications is based on trust. You rely on Docker images to be exactly what they say they are: secure, reliable, robust, and built with the right elements. But just like you can not just blindly trust any random ingredient in your kitchen, similarly the Docker image needs a kind of verification so we don’t need to be concerned about security issues.
DCT is an essential feature for your Docker container security. It allows you to focus on building and deploying amazing applications, while it takes care of the critical tasks of ensuring security.