Setting up secured AI and logging Android

Set up configuration AI to be protected from MITM attacks and from changing (intercepting) AI answers. I need solution which will allow me to use openrouter / ollama / Claude code on my Android devices through any application with api key... (Budget: $750 - $1500 USD, Jobs: AI Automation, AI Integration, AI Model Development, Android, Android App Development, API Development, Graphic Design, Java, Mobile App Development, Security)