How do I sign and verify images for Policy as Code?

In the realm of Policy as Code, signing and verifying images is essential to ensure the integrity and authenticity of the software being used. This process involves cryptographic signatures that verify an image has not been tampered with and originates from a trusted source. Below are the steps and an example for signing and verifying images.

Steps to Sign and Verify Images

  1. Generate a Signing Key: Create a key pair that will be used for signing images.
  2. Sign the Image: Use a tool like cosign to sign the Docker image.
  3. Verify the Image: Use the same tool to verify the integrity and authenticity of the signed image.

Example

// Step 1: Generate your key cosign generate-key-pair // Step 2: Sign the image cosign sign docker://your-repo/your-image:tag // Step 3: Verify the image cosign verify docker://your-repo/your-image:tag

Policy as Code image signing image verification cosign Docker images cryptographic signatures software integrity DevOps

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