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Scenario

Stephen is the campaign manager for Governor Morris, currently on the road in a heated presidential election campaign and carrying a slight lead against rival Senator Pullman. They are in Ohio a few days before the pivotal primary, and each campaign must make careful decisions about how to prepare themselves for an upcoming debate. Team Morris and Team Pullman are both very dedicated to their campaigns and will stop at nothing to ensure that their candidates win the nomination.

Everyone on Team Morris was provided mobile phones that they use as their primary method to stay in touch with each other. Stephen must be in frequent contact with his teammates to ensure that everyone is on the same page concerning the day's activities, and that any urgent news that could potentially change the team's strategy can be quickly disseminated to the entire group. At the same time, the team has to be keenly aware of security in the way they communicate. If anyone not involved with the campaign learned of their activities or strategies, such as the media or a rival, it could severely hurt the campaign.

Stephen has sent team members out for the day to accomplish various tasks. One is visiting a local church where Senator Pullman is giving a speech, to see if they can glean any information about how the opposition will position themselves for the upcoming debate. He is responsible for updating Stephen and and rest of Team Morris on any findings. Several new volunteers are added to the campaign to help place signs and knock on doors in key parts of the city to get the word out about Governor Morris. Stephen has to add these new teammates to his list of secure contacts to ensure they can communicate with one another in a secure manner.

At noon today, Stephen receives a news from Pullman speech that current polls suggest the primary race is now dead even. Of particular note is the realization that key voters in rural Ohio that traditionally backed Morris were beginning to waver. Stephen felt that those voters were paramount and was counting on their support until now, but has dedicated most of his staff to campaigning in the city. Upon receiving this news, Stephen must securely send a message to the team with new orders, and the team members need to be sure that the message is from Stephen and not a diversion. The message must go out without tipping off Team Pullman of the revised strategy.

Later that day, Stephen receives a message from someone claiming to be on Team Pullman. He asks to establish a secure messaging connection with Stephen, which Stephen agrees to. The other person turns out to be Tom Duffy, campaign manager of Team Pullman, and he suspiciously suggests that Stephen ought to consider working for Team Pullman instead of Team Morris. Stephen does not like where the conversation is heading, and decides to end the conversation. He also erases any record of the conversation occurring and removes Tom as a contact, to ensure that no trace of the conversation can be found.

Design 1

Task #1

First, in order to establish a secure connection, Stephan meets with Team Morris and shares his identity. He does this by going to his Contacts panel and clicking share.

This brings up a Stephan's QR code along with his key. Users can manually enter the key or take a picture of the QR code. In this scenario, Stephan prints out the ID page and passes it around to the other members of Team Morris (the lock button is provided in case the user wants to pass around his or her phone).

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Stephen must add the new teammates to his list of
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