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Chinese Journal of Computers

Provably Secure Identity-Based Authenticated Key Agreement Protocols in the Standard Model

Sheng Wang

Published Jan 1, 2007• 18 citations
OpenAlex

Abstract

This paper presents an identity-based key agreement protocols that are provably secure without random oracles(namely,in the standard model).It is inspired by a new identity-based encryption scheme first proposed by Gentry.This paper details how this key agreement can be used in either escrowed or escrowless mode.All the proposed protocols are compared performance(with respect to computational and communication efficiencies) to all known protocols that are only proven secure in the random oracle model.

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In an open and distributed environment, authenticated key agreement protocol, as an important cryptographic primitive, is used to authenticate entities and establish session key in order to provide secure communications. Key escrow is essential in situations where confidentiality and audit trail are legal requirements, whilst perfect forward secrecy and known session-specific temporary information secrecy attributes are desirable to provide stronger security. In this paper, we give a cryptanalysis on the scheme due to Wang et al., which is based on the identity-based encryption scheme proposed by Gentry (Eurocrypt'06), and then present an enhanced secure two-party identity-based authenticated key agreement protocol. The new proposed protocol achieves most of the required security attributes and can be used properly in the escrow mode. Security analysis shows that it achieves the attributes of known-key secrecy, key-compromise impersonation resilience, unknown key-share resilience and no key control. In addition, it captures the perfect forward secrecy and known session-specific temporary information secrecy attributes.

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This paper presents an identity-based key agreement protocols that are provably secure without random oracles(namely,in the standard model).It is inspired by a new identity-based encryption scheme first proposed by Gentry.This paper details how this key agreement can be used in either escrowed or escrowless mode.All the proposed protocols are compared performance(with respect to computational and communication efficiencies) to all known protocols that are only proven secure in the random oracle model.
The security of a provably secure identity-based authenticated key agreement protocol in the standard model was analyzed,and it was found that the protocol used in escrowless mode has security flaws.When the private key generator(PKG) is controlled or attacked,all of the session keys can be obtained.To resist this attack,the identity-based authenticated key agreement protocol was improved.This new protocol was proven to be secure in the standard model and has the property of not needing session key escrow.
Key agreement protocols are essential for secure communications in open and distributed environments. Identity-based cryptography has become extremely fashionable in the last few years for its special advantages. In this paper, we point out some flaw in the scheme proposed by Wang et al., then we present a two-party identity-based explicit authenticated key agreement protocol with key confirmation, which was inspired on a new identity-based encryption scheme first proposed by Gentry and can be used properly in the escrowless mode. The scheme captures the attributes of known-key secrecy, key-compromise impersonation resilience, unknown key-share resilience, perfect forward secrecy, and no-key control. Especially, the scheme captures the PKG forward secrecy property. The PKG still could not recover all the userspsila past session keys even he knows the long-term private keys of all users.
To provide secure communications in open and distributed environments, authenticated key agreement protocol is an important primitive for establishing session key. So far, great deals of identity-based protocols have been proposed to provide robust mutual authentication and key establishment in two-party setting. Majority of the existing escrowable identitybased key agreement protocols, however, only provide partial forward secrecy. Therefore, such protocols are unsuitable for real-world applications that require a stronger sense of forward secrecy -- perfect forward secrecy. In this paper, we present a secure two-party identity-based authenticated key agreement protocol, which was inspired on an identity-based encryption scheme first proposed by Gentry (Eurocrypt'06). The proposed protocol achieves most of the required security attributes and can be used properly in the escrow mode. We show that the scheme achieves the attributes of known-key secrecy, key-compromise impersonation resilience, unknown key-share resilience and no key control. In addition, it captures the perfect forward secrecy attribute.
In this paper, we present a two-party attribute-based key agreement protocol, which is secure in random oracle model under the Bilinear Diffe-Hellman assumption. It is inspired by a fuzzy identity-based encryption scheme first proposed by Sahai and Waters. The attribute-based key agreement scheme is a new type of identity-based key agreement scheme, in which we can view identity as a set of descriptive attributes. Our scheme not only preserves the advantages of traditional identity-based key agreement protocol, but also provides some new properties, such as hiding the identity information of the individual, increasing the flexibility of key management.
In an open and distributed environment, authenticated key agreement protocol, as an important cryptographic primitive, is used to authenticate entities and establish session key in order to provide secure communications. Key escrow is essential in situations where confidentiality and audit trail are legal requirements, whilst perfect forward secrecy and known session-specific temporary information secrecy attributes are desirable to provide stronger security. In this paper, we give a cryptanalysis on the scheme due to Wang et al., which is based on the identity-based encryption scheme proposed by Gentry (Eurocrypt'06), and then present an enhanced secure two-party identity-based authenticated key agreement protocol. The new proposed protocol achieves most of the required security attributes and can be used properly in the escrow mode. Security analysis shows that it achieves the attributes of known-key secrecy, key-compromise impersonation resilience, unknown key-share resilience and no key control. In addition, it captures the perfect forward secrecy and known session-specific temporary information secrecy attributes.