Welcome to the resource topic for 2001/079
Title:
Authenticated Encryption in the Public-Key Setting: Security Notions and Analyses
Authors: Jee Hea An
Abstract:This paper addresses the security of authenticated encryption schemes
in the public key setting. We present two new notions of
authenticity that are stronger than the integrity notions given in the
symmetric setting \cite{bn00}. We also show that
chosen-ciphertext attack security (IND-CCA) in the public key setting
is not obtained in general from the combination of chosen-plaintext
security (IND-CPA) and integrity of ciphertext (INT-CTXT), which is in
contrast to the results shown in the symmetric setting
\cite{ky00,bn00}. We provide security analyses of authenticated
encryption schemes constructed by combining a given public key
encryption scheme and a given digital signature scheme in a
generic'' manner ---namely, Encrypt-and-Sign, Sign-then-Encrypt, and Encrypt-then-Sign--- and show that none of them, in general, provide security under all notions defined in this paper. We then present a scheme called {\em ESSR} that meets all security notions defined here. We also give security analyses on an efficient Diffie-Hellman based scheme called {\em DHETM}, which can be thought of as a transform of the encryption scheme DHIES’’ \cite{abr01} into an {\em
authenticated} encryption scheme in the public key setting.
ePrint: https://eprint.iacr.org/2001/079
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