[Blum '81] Coin Flipping by Telephone

This is the Python implementation of the Blum coin-flipping protocol.

Sample run

pip3 install -r requirements.txt

Bob:

$ python3 bob.py
N = 756490599664322449213833011934085934891729476169
x2 ? 40509115015847360040670018286719210126028088623
j_guess = -1
x ? 90806192710269355608557082872437065203797177274
Outcome = Tails

Alice:

$ python3 alice.py
N ? 756490599664322449213833011934085934891729476169
x2 = 40509115015847360040670018286719210126028088623
j_guess ? -1
x = 90806192710269355608557082872437065203797177274
Outcome = Tails

Let's flip some coins!

My coin-flipping number is 1001566002234152341231810327395747847813363152601. It's publication date is Feb 21, 2022.

To proceed with the protocol, you are welcome to open Issue here or tweet me at @Atamyrat.

Bonus points if you can flip all coins heads up.