Number Cruncher
100 points Hard

I have a program that crunches some data. It's taking forever to compute the value, could you help me crunch this data file? Thanks!

Program link: https://mega.nz/#!eW4DWarQ!7evWrgj93gIfpmY5ksXbzmER_rKM0taw9hZ4v9mq0DE

Data file attached below (fixed).

new_crunch.dat
Flag
Reverse Engineering ยท thekidofarcrania
15 solves
Rating 4.88
5
4
3
2
1
Must solve to rate

Discussion

avatar
Canlex

2 years ago

Reply Share
Protected
0
avatar
Ichild

3 years ago

Reply Share

Analysed a lot, but it deserves. To know what happens in the function with jmp rdi is the key, after that you can write a program with a more effective algorithm (can be found on the web easily if you really know what happens), the result will appear soon.

3
avatar
mavleop

3 years ago

Reply Share

I thought that while it was fun to RE the function you describe, I wasn't a huge fan of just searching for a faster algorithm to copy-paste.

0
avatar
Rivit

3 years ago

Reply Share

Just try to understand program on smaller data set ;)

0
avatar
Rivit

4 years ago

Reply Share

Oh god! Finally!

3
avatar
rasyidmf

4 years ago

Reply Share

Is the answer to this challenge a data type ULL ?

0
avatar
Londek

4 years ago

Reply Share

Lets be honest, this is hardcore

2
avatar
intelagent

3 years ago

Reply Share

Hahaha TKOA makes some awesome challs...

1