Applying Cryptography to Real World Problems Questions

Demonstrate systematic problem-solving for cryptographic scenarios. Given a problem (e.g., designing encryption for real-time messaging), show how you would identify requirements, analyze threat model, select algorithms, design protocol flow, and identify implementation pitfalls. At senior level, discuss tradeoffs between security strength, performance, platform constraints, and compliance requirements. Show awareness of when cryptography alone is insufficient and what else is needed.