Key Agreement Schemes

This chapter is a companion to the previous chapter, where we discussed key predistribution schemes and session key distribution schemes. Both of these kinds of key distribution require a trusted authority () to select keys and distribute them to network users. In this chapter, we turn our attention to key agreement schemes (KAS), in which two users can establish a new session key via an interactive protocol which does not require the active participation of a . Note that we are mainly discussing key agreement schemes in the public-key setting.