Inside the ZIP, you will typically find a META-INF folder containing the update script and the signature, and various system images (like system.img or boot.img ) or file diffs.
Manufacturers use a private key to sign the build and include a corresponding public key in the device's recovery partition. update-signed.zip
Developers often use the SignApk.jar tool to sign their own custom packages. Inside the ZIP, you will typically find a
An is a compressed archive containing the files necessary to update an Android system, along with a cryptographic signature that verifies the file's integrity and origin. Inside the ZIP