Create 4096 bit keys

node_modules/c9/ssh.js

@@ -123,6 +123,7 @@ exports.generateKeyPair = function(email, callback) {
         var phrase = "";
     
         var command = "ssh-keygen -t rsa " +
+            "-b 4096 " +
             "-f \"" + filename + "\" " +
             "-P \"" + phrase   + "\" " +
             "-C \"" + email  + "\" ";