Since NDN leaves the trust model under the control of each application, more flexible and expressive trust relations, may also be expressed. One such example is ChronoChat, which motivated experimentation with a web-of-trust model. The security model is that a current chatroom participant can introduce a newcomer to others by signing the newcomer's key. Future applications will implement a cross-certifying model (SDSI) 3, which provides more redundancy of verification, allowing data and key names to be independent, which more easily accommodates a variety of real-world trust relationships.