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nadams 2017-04-26 10:23:08 -07:00
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@ -155,9 +155,11 @@ So, for example, the following is a point P with coordinates (x,y) that is a poi
P = (55066263022277343669578718895168534326250603453777594175500187360389116729240, 32670510020758816978083085130507043184471273380659243275938904335757337482424)
----
You can check this yourself using Python:
<<example_4_1>> shows how you can check this yourself using Python:
[[example_4_1]]
.Using python to confirm that this point is on the elliptic curve
====
[source, pycon]
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Python 3.4.0 (default, Mar 30 2014, 19:23:13)
@ -169,7 +171,7 @@ Type "help", "copyright", "credits" or "license" for more information.
>>> (x ** 3 + 7 - y**2) % p
0
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====
In elliptic curve math, there is a point called the "point at infinity," which roughly corresponds to the role of 0 in addition. On computers, it's sometimes represented by x = y = 0 (which doesn't satisfy the elliptic curve equation, but it's an easy separate case that can be checked).