Title: An Obsession with Definitions

Abstract: Many people seem to think that cryptography is only about the
creation and analysis of cryptographic schemes.  This view ignores the
centrality of definitions in shaping the problems we collectively work
on, and the way in which we address them. More than schemes or their
analysis, it is definitions that I myself have obsessed on. In this talk
I’ll try to explain why, and talk about a few of these definitions:
authenticated key exchange, garbling schemes, online AE, and onion
encryption.