Remove key escrow from the BF and Gentry identity-based encryption with non-interactive key generation

Quanyun Wei (), Fang Qi () and Zhe Tang ()
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Quanyun Wei: Central South University
Fang Qi: Central South University
Zhe Tang: Central South University

Telecommunication Systems: Modelling, Analysis, Design and Management, 2018, vol. 69, issue 2, No 8, 253-262

Abstract: Abstract Key escrow is inherent in identity based encryption (IBE) since it was first put forward by Shamir. A key generation center (KGC) or private key generator is in charge of generating the user’s secret key, therefore a malicious one can decrypt any ciphertext without being found. This paper introduces a new scheme to eliminate key escrow from IBE. This scheme is based on the security concept of anonymous ciphertext indistinguishability against key generation center (ACI-KGC) which is introduced by Chow. We equip the Boneh and Franklin IBE (BF-IBE) and Gentry-IBE with our scheme and give the security analysis to show the accuracy and the security of it. In contrast to Chow’s scheme, to generate the secret key, our approach does not require the interactive protocol which brings about much extra costs.

Keywords: Identity based encryption; Key escrow; ACI-KGC; Non-interactive protocol (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1007/s11235-018-0461-1

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