\input zb-basic \input zb-ioport \iteman{io-port 02203482} \itemau{Kurosawa, Kaoru; Matsuo, Toshihiko} \itemti{How to remove MAC from DHIES.} \itemso{Wang, Huaxiong (ed.) et al., Information security and privacy. 9th Australasian conference, ACISP 2004, Sydney, Australia, July 13--15, 2004. Proceedings. Berlin: Springer (ISBN 3-540-22379-7/pbk). Lecture Notes in Computer Science 3108, 236-247 (2004).} \itemab Summary: In this paper, we show that MAC can be eliminated from DHIES if the underlying symmetric-key encryption scheme is secure in the sense of IND-CCA. Further, ElGamal encryption part of DHIES without MAC is generalized to Half-Recovery (HR) schemes. Dependent-RSA encryption scheme and Blum-Goldwasser encryption scheme can be used as an HR scheme, for example. Our construction also offers the first secure public-key encryption schemes with no redundancy in the standard model. \itemrv{~} \itemcc{} \itemut{DHIES; hybrid encryption scheme} \itemli{doi:10.1007/b98755} \end