Date Added: Jan 2013
A new paradigm for network applications emerged in the 1990s as the centralized mainframe computer model evolved into a PC client/server based model. This captured a broader scope including business, commerce and finance. Recent, cloud computing and big data deployments suggest that the authors have now come full circle with centrally managed trust infrastructures supporting an even broader application base for any-time, any-where, synchronized access to data and services. This extends the flexibility/manageability of the client/server paradigm and allows for ubiquitous lightweight service endpoints such as notebooks, tablets or smart phones that do not need to store sensitive data (other than cryptographic keys in \"Sealed storage\").