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Complete robustness in Identity-Based encryption

Cui, H.ORCID: 0000-0002-5820-2233, Mu, Y. and Au, M.H. (2014) Complete robustness in Identity-Based encryption. In: Chow, S.S.M., Lui, J.K., Hui, L.C.K. and Yiu, S.M., (eds.) Provable Security. Springer, pp. 342-349.

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Complete robustness (CROB) was proposed to guarantee that for a public key encryption scheme, decryption attempts will fail with high probability if the wrong decryption key is used to decrypt a ciphertext, even if the keys are maliciously generated by the adversary. In this paper, we extend the notion of complete robustness to the identity-based setting. We firstly formalize the CROB for identity-based encryption, and present a generic construction achieving CROB from an arbitrary identity-based encryption scheme. After that, we investigate whether there exist some kind of relations between CROB and related-key attack (RKA) security for the case of identity-based encryption. We conclude that these two notions (CROB and RKA security) are separable for identity-based encryption, but with a slight modification to our generic construction, an identity-based encryption scheme offering complete robustness with security against related-key attacks can be constructed from any identity-based encryption scheme.

Item Type: Book Chapter
Publisher: Springer
Copyright: © 2014 International Publishing Switzerland
Other Information: Series title: Lecture Notes in Computer Science; Vol. 8782
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