Question?

You are leading a team responsible for covertly collecting highly sensitive information. You are the only person allowed to receive this information from each member of your team. Additionally, only you are supposed to send new orders to your team members. Your 100-person team must communicate with you securely from around the globe and does not expect to meet in person any time after the start of the mission. Each member is tasked to send you both text and video files from their locations. You must ensure only you can read the Files, and that your team only receives new orders from you

1) How would you ensure an adversary cannot read any message?

2) How would your team know an order they received only came from you?

3) To keep the video files secure, a new shared-secret key must be generated and distributed before each video transmission.

4) How would you securely generate and distribute this key knowing that the adversary can eavesdrop on all communications?

5) What symmetric protocol would you use to ensure the adversary could not use a brute-force attack method to decrypt the files, and why

6) Does being the sole person sending orders or receiving information provide any information to the adversary, even if the adversary cannot read any messages?