Add encryption module

server/app/models.py

@@ -0,0 +1,22 @@
+from banjo.models import (
+    Model, 
+    StringField, 
+    ForeignKey,
+    BooleanField,
+)
+
+class User(Model):
+    name = StringField(unique=True)
+    public_key = StringField(unique=True)
+
+    def to_dict(self):
+        return {
+            'name': self.name,
+            'public_key': self.public_key,
+        }
+
+class Message(Model):
+    sender = ForeignKey(User, related_name="messages_sent")
+    recipient = ForeignKey(User, related_name="messages_received")
+    ciphertext = StringField()
+    read = BooleanField()