That's exactly the question.
When I downloaded the beta version app from the iPhone, they asked for UDID. Do you mind if I tell you?
953 2015-06-02 Gentleman
Although the UDID is a device unique number, it has nothing to do with security issues.
If you want to download the iPhone app to your actual device when you develop the iPhone, you can register the device on the https://developer.apple.com/ site.
I need to register an ID that identifies my iOS device on the site
This is the UDID.
That's why we need UDID for testing purposes
Looking at the contents below, it seems that there is a security problem with the UDID.
http://www.asiatoday.co.kr/view.php?key=2015012101...
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