Comment on "Circuit Ciphertext-Policy Attribute-Based Hybrid Encryption With Verifiable Delegation in Cloud Computing"

The scheme [1] is flawed because: (1) its circuit access structure is confusingly described; (2) the cloud server cannot complete the related computations; (3) some users can conspire to generate new decryption keys, without the help of the key generation authority.

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Bibliographic Details
Published in:	IEEE transactions on parallel and distributed systems Vol. 32; no. 2; pp. 392 - 393
Main Authors:	Cao, Zhengjun, Markowitch, Olivier
Format:	Journal Article
Language:	English
Published:	New York IEEE 01-02-2021 The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:	Algorithms Authorization Ciphertext-policy attribute-based encryption Circuits Cloud computing Cryptography Encryption hybrid encryption multilinear map verifiable delegation
Online Access:	Get full text
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Description
Summary:	The scheme [1] is flawed because: (1) its circuit access structure is confusingly described; (2) the cloud server cannot complete the related computations; (3) some users can conspire to generate new decryption keys, without the help of the key generation authority.
ISSN:	1045-9219 1558-2183
DOI:	10.1109/TPDS.2020.3021683