Here are a list of some of the best iphone secret photo and video apps that will keep photos and other files password protected.
#1 - My Secret Folder - Best app for password protecting photos, video, text notes, contacts and bookmarks. Create secret notes for passwords and messages, manage secret bookmarks and browse the web in secret. Also the app detects break-in attempts and logs them by GPS and takes a snapshot of the offender so you can catch nosey partners.
#2 - Lock Photo+Video, Docs+Audio+Notes - Allows you to hide your secret photos, videos, voice recording, notes, documents and other files (including PDF, Text(can be created and edited), PowerPoint, Word, Excel, Html, Pages, etc.).
#3 - My Secret Apps - Passcode lock photos and video, private web browser, secure notes and badge alerts tell you about break-in attempts.
#4 - Lock My Folder - Password protect your photos and video on your iphone, ipad or ipod touch. Additional functionality is planned for free future updates, which include Notes, Contacts, and Bookmarks.
#5 - Lock My Photos - Simple app to password protect photos and keep them away from prying eyes.
NOTE: Make sure you backup any photos or video you add to these password lock apps to your computer (or external drive) if you don't want to lose them, otherwise you will probably lose the pics if something happens to the app (such as an uninstall or the app gets messed up). Essentially, just be aware that if something happens you will lose everything that was saved in these apps if you don't have a backup copy somewhere else, so just keep that in mind when adding photos, videos, contacts or documents to these apps.