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IEICE TRANSACTIONS on Fundamentals

A Universally Composable Secure Channel Based on the KEM-DEM Framework

Waka NAGAO, Yoshifumi MANABE, Tatsuaki OKAMOTO

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Summary :

As part of ISO standards on public-key encryption, Shoup introduced the framework of KEM (Key Encapsulation Mechanism), and DEM (Data Encapsulation Mechanism), for formalizing and realizing one-directional hybrid encryption; KEM is a formalization of asymmetric encryption specified for key distribution, which DEM is a formalization of symmetric encryption. This paper investigates a more general hybrid protocol, secure channel, that uses KEM and DEM, while KEM supports distribution of a session key and DEM, along with the session key, is used for multiple bi-directional encrypted transactions in a session. This paper shows that KEM, which is semantically secure against adaptively chosen ciphertext attacks (IND-CCA2), and DEM, which is semantically secure against adaptively chosen plaintext/ciphertext attacks (IND-P2-C2), along with secure signatures and ideal certification authority are sufficient to realize a universally composable (UC) secure channel. To obtain the main result, this paper also shows several equivalence results: UC KEM, IND-CCA2 KEM and NM-CCA2 (non-malleable against CCA2) KEM are equivalent, and UC DEM, IND-P2-C2 DEM and NM-P2-C2 DEM are equivalent.

Publication
IEICE TRANSACTIONS on Fundamentals Vol.E89-A No.1 pp.28-38
Publication Date
2006/01/01
Publicized
Online ISSN
1745-1337
DOI
10.1093/ietfec/e89-a.1.28
Type of Manuscript
Special Section PAPER (Special Section on Cryptography and Information Security)
Category
Public Key Cryptography

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