jwt.private.key & jwt.public.key significance

[Maharana Domburu]

I am creating a new environment(NON-PROD) from an existing environment(PROD) by doing a VM refresh.

I need to update the confluence.cfg.xml file before I start confluence in the new environment. 

Can someone please clarify the significance of jwt.private.key & jwt.ppublic.key ? Also can these keys be used same as existing environment ?

Thank you