All those examples are extremely high level abstractions, but cryptography is not - it is a direct application of math to a single purpose. > ...multiple appro

All those examples are extremely high level abstractions, but cryptography is not - it is a direct application of math to a single purpose. > ...multiple approaches and techniques and tools are always a good thing. Only at a very high level. If you switched out "cryptography" with "privacy protection" then you'd be right.