Apk" — V2

: Because the signature covers the whole file, the Android system can verify the app much more quickly than it can with file-by-file verification.

: It addresses "rollback" attacks and prevents malicious mangling of compressed entries that were possible under the v1 scheme. Safety Report: Sideloading and Modded APKs v2 apk"

While the v2 scheme itself is a security feature, downloading APK files from third-party sources (sideloading) still carries significant risks. How to Protect Your Device from APK Fraud? | RBL Bank : Because the signature covers the whole file,