PhotoLock

Hide pictures & photos securely and conveniently in Photo Lock! - The ultimate hidden gallery app for hiding photos on Android.
Sensitive photos from your Android photo gallery can be kept safely locked away in a secure Photo Locker accessible only via a secret PIN code.

Key features:
1)Encryption - hidden pictures are not only moved to a secret location on your phone but are also encrypted using advanced 128 bit AES encryption. This means that even if someone manage to steal your SD card and copy the hidden picture files, they will still be unable to view the locked photos.
2)User friendly operation - Easily hide photos via default gallery or from within Photo Lock itself.
3)Fast bulk hide - Keep safe hundreds of photos quickly
4)Folder level locking - lock individual hidden photo albums. This allows you to show only 1 hidden photo album without exposing the others.
5)Zoom in and out of hidden photos with multi-touch. Hidden photos maintain their original resolution and are not scaled down as in some other photo hiding apps.
11)You can change your password.

Important Note:

By clicking Photo Lock header in home screen then only you get password popup for going into the hidden pictures.
By default password is "0000"