diff --git a/app/models/request.rb b/app/models/request.rb
index 5a81be719..f39d1267f 100644
--- a/app/models/request.rb
+++ b/app/models/request.rb
@@ -3,6 +3,7 @@ class Request
   include MongoMapper::Document
   include Diaspora::Webhooks
   include ROXML
+  include Encryptable
 
   xml_accessor :_id
   xml_accessor :person, :as => Person
@@ -38,7 +39,26 @@ class Request
     p.save
   end
  
+#ENCRYPTION
+    before_validation :sign_if_mine
+    validates_true_for :creator_signature, :logic => lambda {self.verify_creator_signature}
+    
+    xml_accessor :creator_signature
+    key :creator_signature, String
+    
+    def signable_accessors
+      accessors = self.class.roxml_attrs.collect{|definition| 
+        definition.accessor}
+      accessors.delete 'person'
+      accessors.delete 'creator_signature'
+      accessors
+    end
 
+    def signable_string
+      signable_accessors.collect{|accessor| 
+        (self.send accessor.to_sym).to_s}.join ';'
+    end
+  
   protected
 
   def clean_link