Generate binary random oblivious transfer

[manel1874]

Description

Functionality to generate binary random oblivious transfer for both Sender and Receiver

Definition of done

Generate and save to the keys folder two files sender_brotk.txt and receiver_brotk.txt.

Instructions

1. The header of the file should be generated with the header function currently at simulator.py
2. The key part of both parties should be in binary format.