IdentifierAddition.m
line 57 as follows:
http://www.4freeimagehost.com/show.php?i=aed290c4f532.png

I have a database of users which are identified by their udid and I'm now transitioning to your uniqueGlobalDeviceIdentifier. I'm wondering, is it possible that one of these new identifier ends up being the same as an old udid (but belonging to a different user)?

The udid used to be SHA1(SerialNumber + IMEI + WiFiAddress + BluetoothAddress), whereas this new identifier is MD5(MAC address). I'm not too familiar with how SHA1 and MD5 work, but is it a possibility that, even though all the variables are different, the end result ends up being the same, since they are encrypted using different algorithms?

I understand that Apple are starting to restrict access to the MAC address too. Is this going to affect the functionality?

If so, has anyone got any plans as to how we can generate a unique ID for a device?!

Hi,

I tried to make the classes as static library but when I compiled, I always got this error: "Cannot find interface declaration for "UIDevice".

Target development is iOS 5 and XCode is version 4.3.2. If I required, I can email you the project.

Making UniqueIndentifier using the MAC ID not going to work on IOS 7. Need some other technique if possible.

Apple is now rejecting apps that call it. It should be removed from the code.

iPhone 7.0 later return 02:00:00... all the time

I see this is utilizing LLADDR, a BSD networking tool, to grab the mac address. Has anyone that you know of run this through Apple's private framework checks & review process to make sure it's OK to be using it?

OK, The apple don't want their devices have unique identifiers. But, you create exactly what apple don't want!

So.. Apple failed to achieve his goal. And now, what it can do against your program? Is easy to him detect this this codes and reject programs with it? You know program that was rejected because this?

What do you think?

Haven't inspected the code in great detail, but how unique is this identifier really? MAC Addresses are not unique. There is 16.7 million possible addresses per manufacturer. Given that Apple Sold way more iPhones (250 millions) than possible addresses is only a matter of time before you get same MAC Address for 2 different users.

My understanding is that the App's Bundle Identifier is also the same for all users that download the app, which will not make it unique if two users that have the same MAC address use the same app.

Am I missing something?

As discussed in this commit comment, the library as-is poses a serious privacy leak issue and should not be used:

6755765#commitcomment-1839260

This works ok in a dev build, but as soon as you build for a distribution it will crash.

My users have just started upgrading to the iOS 7 beta, and I'm finding that their UDIDs have changed and hundreds of them are being assigned the same UDIDs as each other.

Would be nice if the readme contained:

1. http://stackoverflow.com/questions/9897162/ios-uuid-generation-throwing-a-strange-exception <- The instructions to make sure both m files are compiled.
2. Im using arc so at the above screen i also had to add "-fno-objc-arc" as a compiler flag
3. add "#import "UIDevice+IdentifierAddition.h"" to the top of the .m file
   4.Better clarification as to the difference between global and regular. Im guessing the regular is app specific so an uninstall reinstall will give you a different number. Whereas global will be the same across reinstalls.

Just a suggestion. If you dont want to do it i can do a pull (i think thats what its called, still new to github)

I got Same Device ID String in my different device, one is ios7.0.4, one is ios8.3, Why?

I never thought about it, but this old way is global for all app, or only for one bundle identifier app? You give us this 2 way :)

For making this noise, I give you this function (I can't sent by git because my "stupid" firewall). Your code give a identifier that don't look like the apple one. Is only put this code to solve:

- (NSString *)lookLikeUniqueIdentifier {
    NSString *code = [[NSString stringWithString:self] uppercaseString];
    return [NSString stringWithFormat: @"%@-%@-%@-%@-%@", 
            [code substringToIndex:8], 
            [code substringWithRange: NSMakeRange(8,4)], 
            [code substringWithRange:NSMakeRange(12,4)], 
            [code substringWithRange:NSMakeRange(16,4)],  
            [code substringFromIndex:20]];
}

Please, could you add a version tag?

I need this to create a cocoapods podspec to this library.

Thanks

An old 4-clause BSD license really? I'm going to add to my marketing material "This product includes tracking software developed by the Georg Kitz" :-P