Serial port bluetooth module Encryption

in order to get permission to use the Serial port bluetooth module in my company, I need detailed information about the used encryption (like key length etc.) and the security of the authentication process. Could you please provide the required information?
Thank you!

You can find the information in the chip manual (see wiki) and/or bluetooth stack documentation.

Thanks for your answer, Rony.
What I’m asking about ist not the Bluetooth standard or the abilities of the chipset, but how these standards and features are implemented in this specific module by means of its firmware.
I cannot find this information in the wiki.