Communication between drones

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Hello everyone!

I am working on a project related to drones. Below are my requirements:

1. Three drones should take off autonomously
2. They should be able to communicate with each other and send encrypted data back and forth.
3. They should be able to control each other's movements. (E.g., drone A commands drone B to fly away)

My questions are:

1. Is something like this even possible in ROS? Sorry if this is a very basic question, I am a .NET Developer, but I am new to ROS.
2. Is this scenario possible in Gazebo or a simulated environment?
3. Are there any cheap, out of drones that I can use for this setup? I've looked up the DIY builds like this: https://www.hackster.io/12590/pi0dron... , but it seems like some components are out of stock or they are very difficult to build.

Any help/pointers would be deeply appreciated. Cheers!