Use well-reviewed, legitimate vault apps from the App Store that have privacy policies.
Because this is an .ipa file and not an App Store link, it is likely intended for sideloading —installing apps outside the official Apple App Store ecosystem. 2. Significant Security Risks download-secret-photo-telefonbuch-ipa
A "secret photo" app is a prime target for spyware. It may transmit your "hidden" photos and contact list to a remote server. Use well-reviewed, legitimate vault apps from the App