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Practical continuous leakage-resilient CCA secure identity-based encryption

Frontiers of Computer Science 2020年第4期14卷 167-180页

作者： Yanwei ZHOU Bo YANG School of Computer Science Shaanxi Normal UniversityXi’an710119China State Key Laboratory of Cryptology Beijing100878China

leakage of private information including private keys of user has become a threat to the security of computing systems.It has become a common security requirement that a cryptographic scheme should withstand various leakage attacks.In the real life,an adversary can break the security of cryptography primitive by performing continuous leakage attacks.Although,some research on the leakage-resilient cryptography had been made,there are still some remaining issued in previous attempts.The identity-based encryption(IBE)constructions were designed in the bounded-leakage model,and might not be able to meet their claimed security under the continuous-leakage attacks.In the real applications,the leakage is unbounded.That is,a practical cryptography scheme should keep its original security in the continuous leakage setting.The previous continuous leakage-resilient IBE schemes either only achieve chosen-plaintext attacks security or the chosen-ciphertext attacks(CCA)security is proved in the selective identity model.Aiming to solve these problems,in this paper,we show how to construct the continuous leakage-resilient IBE scheme,and the scheme’s adaptive CCA security is proved in the standard model based on the hardness of decisional bilinear Diffie-Hellman exponent assumption.For any adversary,all elements in the ciphertext are random,and an adversary cannot obtain any leakage on the private key of user from the corresponding given ciphertext.Moreover,the leakage parameter of our proposal is independent of the plaintext space and has a constant size.

关键词： identity-based encryption CCA security continuous leakage-resilience standard model

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continuous leakage-Resilient Identity-Based Encryption Scheme with CCA Security

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Chinese Journal of Electronics 2019年第4期28卷 682-689页

作者： ZHOU Yanwei YANG Bo Engineering Laboratory of Teaching Information Technology of Shaanxi Province Shaanxi Normal University School of Computer Science Shaanxi Normal University State Key Laboratory of Information Security Institute of Information Engineering

leakage of private information including private key has become a threat to the security of computing systems. It has become a common security requirement that a cryptographic scheme should withstand various leakage attacks, including continuous leakage attacks. In order to obtain an Identity-based encryption(IBE) scheme which can keep its original security in the continuous leakage setting, we propose a new construction method of IBE scheme with Chosen-ciphertext attacks(CCA) security, which can tolerate continuous leakage attacks on many private keys of each identity, and whose security is proved based on the hardness of the classical Decisional bilinear Diffie-Hellman(DBDH) assumption in the standard model. The leakage parameter is independent of the plaintext space and has the constant size.

关键词： continuous leakage-resilience Identity based encryption CCA security Standard model

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