Abstract
Secure data sharing deserves special attention in cloud computing since the operating environment is semi-trusted. Recently, Eltayieb et al. proposed a blockchain-based attribute-based signcryption scheme to secure data sharing in the cloud (Journal of Systems Architecture, doi: https://doi.org/10.1016/j.sysarc.2019.101653). However, after carefully revisiting this scheme, we found out that Eltayieb et al.’s scheme is not secure against confidentiality attack. Thus, the data confidentiality of this scheme is broken, and any data user can have unauthorized access control on outsourced data.
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