APK Signature Scheme

APK Signature Scheme is a security method used to verify that an Android app (APK file) is authentic and hasn't been tampered with. When a developer signs an app, they use a private key to create a digital signature. When you install or update the app, your device checks this signature against the developer's public key. If it matches, the app is trusted; if not, it may be unsafe or altered. This process ensures app integrity, authenticity, and that updates come from the legitimate developer, helping protect users from malicious software.