Hello everyone,
The motivation for me to sturdy reverse engineering was the existence of vShare app (http://www.vshare.com). Firstly, I want to thank the authors of the Book, which is helping me to study RE from scratch, it is really good book and I think uniq!
vShare is the analog of App Store and can be installed on not Jailbroken device through Safari browser. With the help of it, it is possible to install applications on iOS device for free. For me it is still a secrete, how this app could avoid all Apple security on not jailbroken device, and maybe anyone has an assumptions or it will be interesting to discuss.