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Unfortunately I think this may be what we can expect from Coursera. If you're ready for it then it's great. (I've put Boneh's Crypto 1 in the top ten of courses I ever took.) But if you're not familiar with modular arithmetic then you're definitely not familiar with abstract algebra, in which case yeah you need to study that first.

Yep, I've had math through differential equations (so long ago it doesn't matter anymore), but never touched on abstract algebra that I can remember.

Thanks for the info.

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