There are multiple approaches to threat modeling, and anyone who tells you his method is the only right one is mistaken. There aren't any well-established ways to measure the quality of a threat model, and even the term "threat" is open to interpretation. Of course that's the nature of the beast; even in the more mature field of cryptography, many popular algorithms have not been proven to be secure. But, while we can't often prove that a given design is secure, we can learn from our mistakes and avoid repeating them. That is the essence of threat modeling.

At MSDN.

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