Tag-KEM/DEM: A New Framework for Hybrid Encryption |
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Authors: | Masayuki Abe Rosario Gennaro Kaoru Kurosawa |
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Affiliation: | (1) NTT Information Sharing Platform Laboratories, NTT Corporation, Tokyo, Japan;(2) IBM T.J.Watson Research Center, Yorktown Heights, USA;(3) Ibaraki University, Hitachi, Japan |
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Abstract: | This paper presents a novel framework for the generic construction of hybrid encryption schemes which produces more efficient
schemes than the ones known before. A previous framework introduced by Shoup combines a key encapsulation mechanism (KEM)
and a data encryption mechanism (DEM). While it is sufficient to require both components to be secure against chosen ciphertext
attacks (CCA-secure), Kurosawa and Desmedt showed a particular example of KEM that is not CCA-secure but can be securely combined
with a specific type of CCA-secure DEM to obtain a more efficient, CCA-secure hybrid encryption scheme. There are also many
other efficient hybrid encryption schemes in the literature that do not fit into Shoup’s framework. These facts serve as motivation
to seek another framework.
The framework we propose yields more efficient hybrid scheme, and in addition provides insightful explanation about existing
schemes that do not fit into the previous framework. Moreover, it allows immediate conversion from a class of threshold public-key
encryption to a threshold hybrid one without considerable overhead, which may not be possible in the previous approach. |
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Keywords: | Tag-KEM Hybrid encryption Key encapsulation Threshold encryption |
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