1. Draw a figure using PowerPoint or Visio with standard notation (see the slide posted on Canvas) that illustrates a crypto system that will enable LEI's billing system and the customer's payment system to communicate securely with each other satisfying all the requirements stated above. Paste the figure into this document (i.e., do not submit a separate PPT/Visio file). Assignments that do not use standard notations and are not in a single integrated document will get a grade of zero