raise default demanded difficulty from 1 to 2

src/class_sqlThread.py

@@ -245,6 +245,14 @@ class sqlThread(threading.Thread):
         if not shared.config.has_option('bitmessagesettings', 'sendoutgoingconnections'):
             shared.config.set('bitmessagesettings', 'sendoutgoingconnections', 'True')
 
+        # Raise the default required difficulty from 1 to 2
+        if shared.config.getint('bitmessagesettings', 'settingsversion') == 6:
+            if int(shared.config.get('bitmessagesettings','defaultnoncetrialsperbyte')) == shared.networkDefaultProofOfWorkNonceTrialsPerByte:
+                shared.config.set('bitmessagesettings','defaultnoncetrialsperbyte', str(shared.networkDefaultProofOfWorkNonceTrialsPerByte * 2))
+            shared.config.set('bitmessagesettings', 'settingsversion', '7')
+            with open(shared.appdata + 'keys.dat', 'wb') as configfile:
+                shared.config.write(configfile)
+
         # Are you hoping to add a new option to the keys.dat file of existing
         # Bitmessage users? Add it right above this line!
         

src/helper_bootstrap.py

@@ -25,7 +25,7 @@ def knownNodes():
                 shared.knownNodes[stream][peer] = time
     except:
         shared.knownNodes = defaultKnownNodes.createDefaultKnownNodes(shared.appdata)
-    if shared.config.getint('bitmessagesettings', 'settingsversion') > 6:
+    if shared.config.getint('bitmessagesettings', 'settingsversion') > 7:
         print 'Bitmessage cannot read future versions of the keys file (keys.dat). Run the newer version of Bitmessage.'
         raise SystemExit
 

src/helper_startup.py

@@ -42,7 +42,7 @@ def loadConfig():
         # This appears to be the first time running the program; there is
         # no config file (or it cannot be accessed). Create config file.
         shared.config.add_section('bitmessagesettings')
-        shared.config.set('bitmessagesettings', 'settingsversion', '6')
+        shared.config.set('bitmessagesettings', 'settingsversion', '7')
         shared.config.set('bitmessagesettings', 'port', '8444')
         shared.config.set(
             'bitmessagesettings', 'timeformat', '%%a, %%d %%b %%Y  %%I:%%M %%p')
@@ -74,7 +74,7 @@ def loadConfig():
         shared.config.set(
             'bitmessagesettings', 'messagesencrypted', 'false')
         shared.config.set('bitmessagesettings', 'defaultnoncetrialsperbyte', str(
-            shared.networkDefaultProofOfWorkNonceTrialsPerByte))
+            shared.networkDefaultProofOfWorkNonceTrialsPerByte * 2))
         shared.config.set('bitmessagesettings', 'defaultpayloadlengthextrabytes', str(
             shared.networkDefaultPayloadLengthExtraBytes))
         shared.config.set('bitmessagesettings', 'minimizeonclose', 'false')