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1) Login to your Digitalocean dashboard
2) Launch the droplet console
3) Login to the  droplet using root credentials. If you've forgotten your root password then reset it from the dashboard (an email will be sent to you with a temp password).
4) Once you are in then open `/etc/ssh/sshd_config` file and edit this entry `PasswordAuthentication no` to `PasswordAuthentication yes`.
5) Save changes.
6) Reload configuaration `service ssh reload`
7) Now you can login to your droplet from your machines terminal. `ssh root@droplet-ip`
8) copy your new ssh keys to into file `~/.ssh/authorized_keys`: https://www.digitalocean.com/community/tutorials/how-to-set-up-ssh-keys--2
9) Clean up: change back to `PasswordAuthentication no`

SBNBON005

import pandas as pd
import matplotlib.pyplot as plt

# Assuming following csv format 
#
# time                 | Column_Name1 | Column_Name2
# --------------------------------------------
# 2017-02-31 12:00:00  | 1.05597      | 1.05557
# 2017-02-30 16:02:00  | 1.05560      | 1.05558
# 

SBNBON005

How secure is 256 bit security? https://www.youtube.com/watch?v=S9JGmA5_unY&t=2s
Will Quantum Computers break encryption?(Explains how public+private key works) https://www.youtube.com/watch?v=6H_9l9N3IXU

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http://blog.hackerearth.com/2015/05/top-7-algorithms-and-data-structures-every-programmer-should-know-about.html

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Understanding Python variables and Memory Management: http://foobarnbaz.com/2012/07/08/understanding-python-variables/
Adaptive Modular Exponentiation Methods v.s. Python’s Power Function: https://arxiv.org/pdf/1707.01898.pdf

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def is_even(n):
    """uses bitwise operator to check if number is even or odd
    Args: 
        n (int):
    Returns:
        answer (bool): True if even, False otherwise
    """
    return  n & 1 == 0