"According to Apple documentation and other documentation I have read about on disk lock on an iOS device, it seems that in order to take advantage of the advanced encryption of the device the user must have a passcode enabled so that when you use the NSDataWritingFileProtectionComplete attribute it will encrypt.
What if the user does not have a passcode set but I still want to ensure the files are encrypted? What options are there for this scenario and how to lock a file?"
After you install the program, you can create a "New Volume," which is the space where you'll be storing the files you wish to send. Anything you put in the volume will be encrypted. You will set a password for the volume, and then "mount" the volume. Mounting the volume basically means you're making it available to put stuff into it, and unmounting will lock the volume from any changes.
Here is about how to lock files on Windows 7/Windows 8/XP system with Advanced Folder lock, follow the detailed steps of locking a file/folder and make sure your sensitive data are beyond reach of bad guys or rivals.
Download the Kakasoft AdvancedFolder Encryption Setup program by clicking on the button below.
Step 1 Install the application in your computer.
If this is the first time for you to use Kakasoft Advanced Folder Encryption to lock files you have to install it first.
Step 2 Select a file to lock
When you finish the installation, in the prompted main window of the program you can begin to lock file.
Step 3 Set a password andlock file
To set password you are required to enter your password and then re-enter it, next you can select a suitable security strength to lock a file.
It offers 3 different security strengths to meet users with different needs. If this is the first time for you to lock files you'd better use "Normal" as the default setting to lock your file. "Normal" is easy to handle and allows you retrieve your password in case you forget it.
This is a extremely easy-to-use software, so that anyone even a computer novice can password protect the file with the help of explicit user guide.
What Is Encryption?
But before we get ahead of ourselves, let's take a quick look into what encryption is and how it works. Imagine you are going to send a postcard in the mail. You go to your nearest mailbox and drop the postcard into the slot. What many of us forget is that anyone who handles the postcard on the way to its destination will be able to read exactly what you wrote. This is similar to what happens when your data is sent over an unsecure connection—anyone who intercepts the message has the ability to read it.