I have an Android phone with Vault application installed. My phone has 32 GB internal storage. The problem is my phonecan not boot anymore. I don't need the files in the Vault actually, but my only concerned is to let it fall in the wrong hands. So will it be possible for someone to extract files from the Vault folder in a damaged phone?
No. Even if the files from the Vault folder are extracted, there is no way to read them without your Vault password. The program uses an encryption algorithm to lock the data. To decrypt the items stored in Vault, you need the password.