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International journal of network security

Key Generation Protocol in IBC.

Dhruti P. Sharma, Devesh C. Jinwala

Published Sep 1, 2013• 1 citation
Publisher

Abstract

Identity Based Cryptography (IBC) is well known method in the field of security, however it has an inherent drawback of Key Escrow under which central key generation center is a sole issuing authority of private key and thus could misuse it. Our survey finds numerous solutions of key escrow; out of them secure key issuing protocol (SKIP) is most prominent. However, there are scopes for improving communication efficiency of this protocol. Thus, we propose an improved version of this protocol by employing clustering approach. With theoretical and empirical analysis, we demonstrate that the proposed approach indeed effectively reduces the communication overheads and improves efficiency of the original secure key issuing protocol.

DOI
10.6633/ijns.201309.15(5).03

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Identity Based Cryptography (IBC) is well known method in the field of security, however it has an inherent drawback of Key Escrow under which central key generation center is a sole issuing authority of private key and thus could misuse it. Our survey finds numerous solutions of key escrow; out of them secure key issuing protocol (SKIP) is most prominent. However, there are scopes for improving communication efficiency of this protocol. Thus, we propose an improved version of this protocol by employing clustering approach. With theoretical and empirical analysis, we demonstrate that the proposed approach indeed effectively reduces the communication overheads and improves efficiency of the original secure key issuing protocol.
Identity-based Cryptography (IBC) is an exciting alternative to public-key Cryptography (PKC), as it eliminates the need for certificate that is a major issue in PKC. However, IBC suffers from an additional limitation viz. the key escrow problem - that is - a user's private key is generated by the central trusted Key Generation Centre (KGC) - that being a single entity, lends itself to the security vulnerabilities in the cryptosystem. One of the prominent solutions proposed as Secure Key Issuing Protocol by Lee. et al. which uses a distributed protocol to generate the private key for user. However, this approach entails significant communications overhead. Hence, in this paper we have proposed an improved Identity based Secure Key Generation Protocol that gives the complete solution of key escrow problem, using clustering based approach. The proposed scheme involves less number of authorities in the computation of the public/private key pair and hence is more efficient. As we further analyze in the paper, our protocol also provides protection against the possible collusion attack in Lee's protocol. To the best of our knowledge, this is a simple, yet efficient and unique attempt to overcome the key escrow problem in IBCs.
In this paper, we propose a robust distributed threshold key transfer protocol or issuing protocol that solves the key escrow problem in identity-based approach. We use threshold cryptographic techniques in each phase of the algorithm such as in system public key setup, key issuing, key securing and private key reconstruction. Our protocol is robust means even t KPA's (out of n = 21 + 1) are corrupted or dishonest the user recover the private key. This protocol can be efficient even if the communication between authorities (KGC and KPAs) is insecure. This approach is useful and offer benefits that are in identity-based techniques, while eliminating key escrow from the setup. In this protocol, either KGC or KPA cannot cheat the users to obtain their private keys. Security analysis of proposed protocol and active adversary assumptions are also presented.
Key issuing protocols deal with overcoming the two inherent problems: key escrow and secure channel requirement of the identity based cryptosystems. An efficient and secure key issuing protocol enables the identity-based cryptosystems to be applicable in the real world. We analyze an threshold key issuing protocol due to Gangishetti et al. and show that the protocol suffers from the attacks of the malicious KGC and the users can deny that they have never received the key. Furthermore, we present an improved protocol, which is undeniable and secure against KGC's attacks.
Traditional public key cryptography uses certificates to bind the users with their public keys and are considered the best alternative for key distribution, but requires to have a very involved key management process. Identity based cryptography makes the key management easier but suffers from the key escrow problem and requires secure channel to issue the private keys to the users. Key issuing protocols deal with secret key issuing (SKI) process to overcome the two problems. We present an efficient and secure key issuing protocol which enables the identity based cryptosystems to be more acceptable and applicable in the real world. In the protocol, neither key generating center nor key privacy authority can impersonate the users to obtain the private keys. Performance and security analysis are being carried out for the protocol and is shown that it is efficient and secure against replay, man-in-the-middle and insider attacks.
Key issuing protocols deal with overcoming the two inherent problems: key escrow and secure channel requirement of the identity based cryptosystems. An efficient and secure key issuing protocol enables the identity-based cryptosystems to be applicable in the real world. We analyze an threshold key issuing protocol due to Gangishetti et al. and show that the protocol suffers from the attacks of the malicious KGC and the users can deny that they have never received the key. Furthermore, we present an improved protocol, which is undeniable and secure against KGC's attacks.