Is that the btlejucie only useful for legacy secure connection？

[Gunkkk]

Is there any detail about the attack， something like a paper ？
Thanks！

[noizy-sthlm]

I believe that the tool is only for secure simple pairing (legacy) using Just Works pairing mode (I'm not completely sure though). A paper that I found useful was this [1]. You can also search for the presentation at Def Con 24 (2016) on YT.

[1] K. Lounis and M. Zulkernine, Bluetooth Low Energy Makes “Just Works” Not Work