THE iDOLM@STER Million Live Theater Days (abbreviation: MLTD) went online on June 28 (UTC +01:00). Similar to its sister app CGSS, it uses CRI Middleware’s audio solution. More specifically, encrypted HCA audio. We must obtain the decryption key to reveal the contents of those audio files. In this article, we discuss the concept and procedure of obtaining the key.
Beware, MLTD does not have a game library for X86 processors, and it requires OpenGL ES 3.0. Don’t be surprised. So we cannot run it on normal Android emulators (there is one but it brings other restrictions), and we have to face ARM assembly language instead of usual X86 assembly language.
I wrote this article to share the thoughts and the method I used. I appreciate the way of hackers in 1960s-1970s. Challenging and sharing. Exciting. Hope this article lights up more inspirations.