The Basics of Elliptic Curve Cryptography (ECC)

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The Basics of Elliptic Curve Cryptography (ECC):

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Hi there - First, Thank you so much, this is the Best tutorial I have come across. I do have 1 question for you currently (if this is ok to ask). When you list the quadratic residues (2, 9)(2, 2)(3, 1)(, 3, 10)(4, 4)(4, 7)(5, 0)(6, 5)(6, 6)(7, 3)(7, 9) - You then mention 'the values going in will always give us a diff value out so this gives us 9, 1, 4, 0, 5, 6)' - Please can you help me understand why you don't mention the other quadratic residues listed? (so 2, 10, 7, 9) - Please accept my apologies if I have missed something in the tutorial. Kindest Regards, Amanda

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Why point (2, 9) is a valid point? there is no x that satisfies this point on the curve, or I am missing something?

maxzab