Common Contracts

Constructing Certificateless Encryption and ID-Based Encryption from ID-Based Key Agreement

August 30th, 2010

• Filed
  August 30th, 2010

Abstract. We discuss the relationship between ID-based key agreement protocols, certificateless en- cryption and ID-based key encapsulation mechanisms. In particular we show how in some sense ID-based key agreement is a primitive from which all others can be derived. In doing so we focus on distinctions between what we term pure ID-based schemes and non-pure schemes, in various security models. We present security models for ID-based key agreement which do not “look natural” when considered as analogues of normal key agreement schemes, but which look more natural when considered in terms of the models used in certificateless encryption. Our work highlights distinctions between the two ap- proaches to certificateless encryption, and adds to the debate about what is the “correct” security model for certificateless encryption.