1 and V 1 only verify the contents of uncompressed files. After APK is signed, many modifications can be made, and the file can be moved or even recompressed. V2 verifies all bytes of the compressed file, not a single ZIP entry.

2. In the v 1 version of the signature, the signature exists in the apk package in the form of a file, and the v4 signature must exist in. Idsig file, but not in APK file.