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<h1>Messenger</h1>
<div class="level1">

<p>
Frequently there is a need to communicate with People with same interests or located in the same area. Examples:
</p>
<ul>
<li class="level1"> a hotel guest might want to discover groups of the hotel</li>
<li class="level1"> at some event men want to organize Minyan and want a way to agree on time and place</li>
<li class="level1"> a lost child or item was found and want to announce that in "Lost and Found" group of the area</li>
<li class="level1"> a person wants to discuss some public event with like-minders</li>
</ul>

<p>
For matter of the Machon Tal Term Project Success, the POC would allow flow below:
</p>
<ol>
<li class="level1 node"> A person creates "stored query" with properties below:<ul>
<li class="level3"> kind: Messages</li>
<li class="level3"> with date not older than week ago</li>
<li class="level3"> geo: X,Y with radius R</li>
<li class="level3"> query lifetime for the next 2 hours</li>
</ul>
</li>
<li class="level1 node"> He reviews results and sees summary of Messages found, grouped by topic name and number of unique posters (implying activity) and wants to subscribe to certain topic:<ul>
<li class="level3"> he creates folder with "chat view" Memo with the topic id, and exports it</li>
<li class="level3"> the Memo automatically creates "stored query" for Memos of kind:Message, date not older than week ago and that topic id</li>
<li class="level3"> any message Memo he creates will contain same topic id, and get consumed by other subscribers</li>
<li class="level3"> he might want to enable popup notification on every incoming message</li>
</ul>
</li>
</ol>

<p>
The scenario above might be extended to cover more cases like these:
</p>
<ul>
<li class="level1"> ignore someone that posts offensive content</li>
<li class="level1"> send message about group details to someone ("Invite them")</li>
<li class="level1"> propose "group" icon that allows voting. The one with most votes is shown as "group" logo</li>
</ul>

</div>

<h2>Privacy (aka Mail mode)</h2>
<div class="level2">

<p>
There might be need to for private Memos exchange between two or more parties. For many-to-many communcations, single shared pubkey is created, per the flow below:
</p>
<ol>
<li class="level1"> An public/private keypair is created</li>
<li class="level1"> For each recipient, it is encrypted with his public key and Memo of kind "KeyPair" and recipient id is created</li>
<li class="level1"> Recipients has active subscription to all Memos of kind "KeyPair" and recipient equals his id</li>
<li class="level1"> recipient receives the "KeyPair" Memo, decrypts it and stores in his keyring.</li>
<li class="level1"> recipient subscribes to all Memo of kind "Encrypted" and id=hashed keyring</li>
<li class="level1"> All messages shared in the folder are encrypted using the keyring</li>
</ol>

</div>

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