Index: lams_bb_integration/src/org/lamsfoundation/ld/integration/blackboard/UserDataServlet.java
===================================================================
diff -u -r8ea6dac2e1f9e39a41030dd5907592bc2aa04d17 -rc14eb93a1f28c7122d23492ba66e937a133a711c
--- lams_bb_integration/src/org/lamsfoundation/ld/integration/blackboard/UserDataServlet.java	(.../UserDataServlet.java)	(revision 8ea6dac2e1f9e39a41030dd5907592bc2aa04d17)
+++ lams_bb_integration/src/org/lamsfoundation/ld/integration/blackboard/UserDataServlet.java	(.../UserDataServlet.java)	(revision c14eb93a1f28c7122d23492ba66e937a133a711c)
@@ -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");
             }