How to create Unique Identifier and save it to identify user(device)

I want to create unique identifier on iOS 5 and use it for identifying user (user device) every time app is started. I am able to create a unique identifier by following code
CFUUIDRef theUUID = CFUUIDCreate(NULL);
CFStringRef string = CFUUIDCreateString(NULL, theUUID); CFRelease(theUUID);
But unable to save it on user device so that particular identifier is not deleted even when app is uninstalled. I tried using SSKeychain approach but it gives Apple Mach-o Linker error.
Please let me know the the way I can accomplish the same.
Any help is appreciated.

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How to create Unique Identifier and save it to identify user(device)

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