Sender Scorecards

In this article, a basic scheme and numerous variants on the use of SSCs were presented. Typical scorecard content, including critical user and device identification categories, was also provided. In presenting the basic architecture for the scorecards, key infrastructure elements were introduced: 1) an SC-I that provides a signature, timestamp, and queries assertion information providers; 2) an SC-P that verifies the presence of the receiving device in the receiving domain and makes the final decision on the call; and 3) an SC-V that veri fies the signature and identity claims of the SSC.