[dragontamer]

Your tool seems to understand the gist of differential cryptography better though.

You can track a 1-bit change or 3-bit change to "M" and see how it propagates through the SHA256 rounds in your tool.

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So your tool is probably better at understanding the underlying design of SHA2. We know that SHA2 was created well into the era of differential-analysis for example, so the designers would have inevitably done analysis similar to how your tool works.