Whitebox RSA is absolutely fascinating. But also totally stupid...
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I'm going to start dumping all the public info about Whitebox RSA I can find in this thread. Patent US20160328543A1: "Protecting the input/output of modular encoded white-box rsa" https://patents.google.com/patent/US20160328543A1/en?oq=20160328543 …
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The gist of this one is that you multiply your input by a randomly generated "pre-multiplier", perform modular exponentiation, and then multiply by the "post-multiplier" which is calculated based on the pre-multiplier and the other parameters.
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So it is! As you can tell, I'm a bit of a crypto noob. It seems like this would do a good job of protecting the exponentiation itself from hardware side channels, but not very useful for software attacks.
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