Encrypt your photos on your device and keep them safe from others.
Photok is a free Photo-Safe. It stores your photos encrypted on your device and hides them from others. It uses technologies like, AES-256 encryption standard or bcrypt, to keep your photos secure. Photok is completely free, open source, and contains no ads.
Photok is available at Google Play and F-Droid. Aswell as some alternatives.
Alternative 1: Direct Download APK
Alternative 2: F-Droid (IzzyOnDroid)