Cryptzone, a Waltham-based cybersecurity firm, was acquired as part of a multi-party $2.8 billion deal that aims to create a new company focused on providing businesses with secure access to cloud data storage.

The new entity, which doesn’t yet have a name, is a joint venture between private equity firms BC Partners and Medina Capital that combines four Medina portfolio companies, including Cryptzone, with 57 data storage centers purchased from telecommunications firm CenturyLink. CenturyLink will…