Index: lams_bb_integration/src/org/lamsfoundation/ld/integration/blackboard/UserDataServlet.java
===================================================================
diff -u -r8af1746d179f41095b074fef269722c6689b39eb -rda77e5e81b8436a465901f033220466923e2bdc2
--- lams_bb_integration/src/org/lamsfoundation/ld/integration/blackboard/UserDataServlet.java	(.../UserDataServlet.java)	(revision 8af1746d179f41095b074fef269722c6689b39eb)
+++ lams_bb_integration/src/org/lamsfoundation/ld/integration/blackboard/UserDataServlet.java	(.../UserDataServlet.java)	(revision da77e5e81b8436a465901f033220466923e2bdc2)
@@ -83,7 +83,7 @@
             String secretKey = LamsPluginUtil.getSecretKey();
             String serverId = LamsPluginUtil.getServerId();
             
-            if(!sha1(tsParam+ usernameParam + serverId + secretKey).equals(hashParam)){
+            if(!sha1(tsParam.toLowerCase() + usernameParam.toLowerCase() + serverId.toLowerCase() + secretKey.toLowerCase()).equals(hashParam)){
                 response.sendError(HttpServletResponse.SC_UNAUTHORIZED, "authentication failed");
             }