Improved Cryptanalysis of Provable Certificateless Generalized Signcryption
Journal Title: International Journal of Advanced Computer Science & Applications - Year 2019, Vol 10, Issue 4
Abstract
Certificateless generalized signcryption adaptively work as certificateless signcryption, signature or encryption scheme having single algorithm for suitable storage-constrained environments. Recently, Zhou et al. proposed a novel Certificates generalized scheme, and proved its ciphertext indistinguishability under adaptive chosen ciphertext attacks (IND-CCA2) using Gap Bi-linear Diffie-Hellman and Computational Diffie-Hellman assumption as well as proved existential unforgeability against chosen message attacks (EUF-CMA) using the Gap Bi-linear Diffie-Hellman and Computational Diffie-Hellman assumption in random oracle model. In this paper, we analyzed Zhou et al. scheme and unfortunately proved IND-CCA2 insecure in encryption and signcryption modes in defined security model. We also present a practical and improved scheme, provable secure in random oracle model.
Authors and Affiliations
Abdul Waheed, Jawaid Iqbal, Nizamud Din, Shahab Ul Islam, Arif Iqbal Umar, Noor ul Amin
Keywords
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- EP ID EP552381
- DOI 10.14569/IJACSA.2019.0100475
- Views 73
- Downloads 0
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