A staff member of the EU working for the European External Action Service (EEAS) needs to share a confidential report about a security mission with a distributed team across several countries. The staff member must ensure that access to this document is strictly limited to authorized members of the team and that data integrity is protected during transmission. According to the EEAS framework and the EU's general principles of digital security, which is the most appropriate measure to manage this scenario in a secure and collaborative manner?