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    block this user Michel Abdalla Trusted member

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    École normale supérieure

    A Simple Threshold Authenticated Key Exchange from Short Secrets

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    This paper brings the password-based authenticated key exchange (PAKE) problem closer to practice. It takes into account the presence of firewalls when clients communicate with authentication servers. An authentication server can indeed be seen as two distinct entities, namely a gateway (which is the direct interlocutor of the client) and a back-end server (which is the only one able to check the identity of the client). The goal in this setting is to achieve both transparency and security for the client. And to achieve these goals, the most appropriate choices seem to be to keep the client's password private ---even from the back-end server--- and to use threshold-based cryptography. In this paper, we present the Threshold Password-based Authenticated Key Exchange (GTPAKE) system: GTPAKE uses a pair of public/private keys and, unlike traditional threshold-based constructions, shares only the private key among the servers. The system does no require any certification ---except during the registration and update of clients' passwords--- since clients do not use the publickey to authenticate to the gateway. Clients only need to have their password in hand. In addition to client security, this paper also presents highly-desirable security properties such as server password protection against dishonest gateways and key privacy against curious authentication servers.

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    Title : A Simple Threshold Authenticated Key Exchange from Short Secrets
    Abstract : This paper brings the password-based authenticated key exchange (PAKE) problem closer to practice. It takes into account the presence of firewalls when clients communicate with authentication servers. An authentication server can indeed be seen as two distinct entities, namely a gateway (which is the direct interlocutor of the client) and a back-end server (which is the only one able to check the identity of the client). The goal in this setting is to achieve both transparency and security for the client. And to achieve these goals, the most appropriate choices seem to be to keep the client's password private ---even from the back-end server--- and to use threshold-based cryptography. In this paper, we present the Threshold Password-based Authenticated Key Exchange (GTPAKE) system: GTPAKE uses a pair of public/private keys and, unlike traditional threshold-based constructions, shares only the private key among the servers. The system does no require any certification ---except during the registration and update of clients' passwords--- since clients do not use the publickey to authenticate to the gateway. Clients only need to have their password in hand. In addition to client security, this paper also presents highly-desirable security properties such as server password protection against dishonest gateways and key privacy against curious authentication servers.
    Subject : unspecified
    Area : Computer Science
    Language : English
    Affiliations : 
    Url : http://www.di.ens.fr/users/mabdalla/papers/ACFP05-letter.pdf
    Doi : 10.1.1.59.9070

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