Only your security architects can truly tell you if this is necessary for your business. Remember that everything you send over the wire is unsafe when using basic HTTP. Perhaps this is not a problem within the enterprise. But anyone who sniffed traffic could intercept your messages and easily get to the data inside.
At Tellago, we made WCF-Data Power integration using custom federated security (almost the same as in Geneva, WIF) for our customers. But, most likely, if you ask if you need security, you are probably not using federated security.
Don demsak
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