Reference with script python kangaroo
http://bitchain.pl/100btc/pollard_kangaroo.txt

(now host down) backup
https://github.com/secoc/Pollard-Rho-kangaroo/blob/master/Pollard_Rho_kangaroo_with_Python2.7_demo.py
http://fe57.org/forum/thread.php?board=4&thema=1#1


What is DP_rarity ?
DP_rarity = 1 << (problem - 2 * kangoo_power) // 2 - 2

Is DP_rarity  same  DP method  (distinguished point DP) right?

if P.x % DP_rarity == 0:

What is code check ? Modulus to zero  this mean collision ?