Abstract
Although a few unidirectional single-hop Identity-Based Proxy Re-Encryption (IBPRE) systems are available in the literature, none of them is CCA secure in the standard model. Besides, they can not support conditional re-encryption property, which allows a delegator to specify a condition for ciphertexts so that the proxy can re-encrypt ciphertexts only if the re-encryption key corresponding to the same condition is given. This paper, for the first time, proposes a new unidirectional single-hop Identity-Based Conditional Proxy Re-Encryption (IBCPRE) scheme that not only captures the property of IBPRE (i.e. identity-based re-encryption), but also supports conditional re-encryption. Moreover, the scheme can be proved secure against adaptive condition and adaptive identity chosen-ciphertext attacks in the standard model.
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Liang, K., Liu, Z., Tan, X., Wong, D.S., Tang, C. (2013). A CCA-Secure Identity-Based Conditional Proxy Re-Encryption without Random Oracles. In: Kwon, T., Lee, MK., Kwon, D. (eds) Information Security and Cryptology – ICISC 2012. ICISC 2012. Lecture Notes in Computer Science, vol 7839. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-37682-5_17
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DOI: https://doi.org/10.1007/978-3-642-37682-5_17
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