I did some information security throughout my studies so I know what you're on about. However, some people still beleive that secrecy of the used algorithm adds significantly to the security of the overall outcome, and at UBI I'm pretty sure that the decision whether to release such information or not is not made by someone who designed and understands the security measures but by someone who wears a suit, a tie, goes to meetings and takes pleasure in the repeated confirmation that "The new DRM system is gonna be reeeeeeealy safe, Sir!"
Additionally: I know that I can get that information with a packet sniffer. That would be among the first things I'd run if I should get my hands on a legit copy of SH5 by some miraculous way that does not involve me handing over money. However, I consider this information relevant for making a decision whether to buy the thing or not. So unless someone does this network analysis for me I don't see how I should get this info.