JLP doesn't respond much these days. I know his code works (but is limited to x bits) because his code was used to solve #110 and #115. Not sure about #120 or #125 because no one has claimed they solved them and what was used.
did you run the normal etar kangaroo or the fractional one?
UPDATE:
Try etar's again. Here's the thing, your initial range size is 2^26; his says the range has to be higher than 2^32 (or else it's just a waste of time since even a brute force program can find that within seconds)
Try this config:
-rb 2F633CBE3EC02B9401000000000000000 -re 2F633CBE3EC02B94010000000ffffffff -pub 021c20007f8c8984d403a695494d6afbff37f55a01c8bd1aafb9b958fa9485bb02
I ran it and it found the key.
Thanks WanderingPhilospher for the quick answer, i am sorry as i was away for few days.
Also many thanks for the explanation, you are very right Etar Kangaroo didn't even start and i was wondering why but as you explained the range was very small.
After using a bigger range (as you did) and i even used bigger range and found the key - perfect.
Then i started it with the #130 and the full range .. and after 24h there was 100GB of work file but nothing was found - as expected
Now i started it with the fractional but as you know it uses the JeanLucPons Kangaroo (which loses performance) but lets see how it goes.
Another issue with the tools is the good explanation of the parameters and the configuration also some more detailed information behind those to understand how and why to use them.
by the way, are you the developer of this https://github.com/WanderingPhilosopher/VanBitCrackenRandom2 ... seems you are also very expert in that subject
Thanks citb0in for your response and the info about the Kanga-256.
I wish to spend more time on this subject, but not easy.
I will update you about any progress
Regards