A junior EU official at the European External Action Service (EEAS) is preparing a secure video briefing with a diplomatic partner in a third country. The briefing will contain sensitive operational data and must be accessible to the recipient but not to unauthorized third parties. According to the EU's approach to digital security and the role of the EEAS in coordinating international action, which of the following actions BEST ensures the confidentiality and integrity of the communication while adhering to digital safety principles?