Question

What are the challenges of symmetric key cryptography?

Answer 1

The key exchange problem arises from the fact that communicating parties must somehow share a secret key before any secure communication can be initiated, and both parties must then ensure that the key remains secret. Of course, direct key exchange is not always feasible due to risk, inconvenience, and cost factors. The catch-22 analogy refers to the question of how to securely communicate a shared key before any secure communication can be initiated.