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    École normale supérieure

    DHIES: An encryption scheme based on the Diffie-Hellman Problem

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    This paper describes a Diffie-Hellman based encryption scheme, DHIES (formerly named DHES and DHAES), which is now in several (draft) standards. The scheme is as efficient as ElGamal encryption, but has stronger security properties. Furthermore, these security properties are proven to hold under appropriate assumptions on the underlying primitive. DHIES is a Diffie-Hellman based scheme that combines a symmetric encryption method, a message authentication code, and a hash function, in addition to number-theoretic operations, in a way which is intended to provide security against chosenciphertext attacks. The proofs of security are based on the assumption that the underlying symmetric primitives are secure and on appropriate assumptions about the Diffie-Hellman problem. The latter are interesting variants of the customary assumptions on the Diffie-Hellman problem, and we investigate relationships among them, and provide security lower bounds. Our proofs are in the standard model; no random-oracle assumption is required.

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    Description

    New Full text for this article was not available? Send a request to the author(s).
    Title : DHIES: An encryption scheme based on the Diffie-Hellman Problem
    Author(s) : Michel Abdalla, Mihir Bellare, and Phillip Rogaway
    Abstract : This paper describes a Diffie-Hellman based encryption scheme, DHIES (formerly named DHES and DHAES), which is now in several (draft) standards. The scheme is as efficient as ElGamal encryption, but has stronger security properties. Furthermore, these security properties are proven to hold under appropriate assumptions on the underlying primitive. DHIES is a Diffie-Hellman based scheme that combines a symmetric encryption method, a message authentication code, and a hash function, in addition to number-theoretic operations, in a way which is intended to provide security against chosenciphertext attacks. The proofs of security are based on the assumption that the underlying symmetric primitives are secure and on appropriate assumptions about the Diffie-Hellman problem. The latter are interesting variants of the customary assumptions on the Diffie-Hellman problem, and we investigate relationships among them, and provide security lower bounds. Our proofs are in the standard model; no random-oracle assumption is required.
    Keywords : Cryptographic standards, Diffie-Hellman key exchange, ElGamal encryption, elliptic curve cryptosystems, generic model, provable security.

    Subject : unspecified
    Area : Computer Science
    Language : English
    Affiliations :  École normale supérieure
    Url : http://www-cse.ucsd.edu/users/mihir/papers/dhaes.ps
    Doi : 10.1.1.62.344

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