Authenticated Encryption: Relations among Notions and Analysis of the Generic Composition Paradigm
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The popular Katz-Yung compiler from CRYPTO 2003 can be used to transform unauthenticated group key establishment protocols into authenticated ones. In this paper we present a modification of Katz and Yung's construction which maintains the round complexity of their compiler, but for 'typical' unauthenticated group key establishments adds authentication in such a way that deniability is achieved as well. As an application, a deniable authenticated group key establishment with three rounds of communication can be constructed.