A free app for Android, by Wafer Co.

Vault Russian language pack is a free mobile app for Android devices and tablets that allows you to hide your important files such as photos, contacts, SMS, and videos in a safe and secure vault.

The app is locked and it is secured by a password that you will set, so no one will ever enter the vault app. You can also hide the app itself from your screen. You can also browse securely in this app, leaving no tracks behind.

Vault Russian language pack also has a smart function where you can track unauthorized access and it alerts any malicious people who try to break in.