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...alid in the context of the scheme. In 2014, Chen et al. [3] proposed two computation outsourcing schemes for LE and LP. Both two schemes are insecure because the technique of masking a vector with a diagonal matrix is vulnerable to statistical analysis attacks. In 2015, Salinas et al. [13] proposed a scheme for outsourcing LE, which makes use of the conjugate gradient method to solve the equivalent quadratic program in the client-server scenario. Recently, LETTER International Journal of Network Security, Vol.19, No.2, PP.323-326, Mar. 2017 (DOI: 10.6633/IJNS.201703.19(2).16) 324 Hsien et al. [6, 9] presented two surveys of public auditing for secure data storage in cloud computing. In this note we would like to stress that the proposed peculiar form by Wang et al. [15] and Nie et al. [11] is unsolvable and meaningless. In fact, they did not consider the standard form: Minimize cTx, subject to Ax = b,x ≥ 0. Instead, they studied a peculiar form: Minimize cTx, subject to Ax = b,Bx ≥ 0, where A is an m× n matrix, c is an n× 1 vector, b is an m × 1 vector, x is an n × 1 vector of variables, and B is an n× n non-singular matrix. They have confused the functional inequality constraints Bx ≥ 0...

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...ocation 1 Introduction Cloud computing is a new network computing model [16] based on virtualization technology and pay-on-demand business model, which can convert various types of resources (including hardware, platform and software) into services that can be used by cloud users with some special features, such as flexible expansion, dynamic resources allocation, and resource sharing. Dynamic resource allocation and sharing in a cloud computing environment is the common fundamental technology of IaaS (Infrastructure as a Service), PaaS (Platform as a Service) and SaaS (Software as a Service) [5, 7], thus forms a major direction of research on cloud computing technologies. As an effective mechanism for controlling resource access in systems, access control can restrict resources utilization of access subjects according to their identities and predefined policies, thus effectively ensuring confidentiality, integrity, availability and legal of resources. It is one of the key mechanisms for isolating access behaviors of different users in a system in order to limit security risks. Therefore, access control can be used as a technical solution to the problems of resource allocation in cloud c...

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...ided verification. In 2014, Canard, Devigne and Sanders [2] provided some efficient ways to delegate the computation of a pairing e(A,B), depending on the status of A and B. Their protocols enable the limited device to verify the value received from the third party by computing one exponentiation. In 2015, Liu et al. [16] considered the problem of server-aided anonymous attribute-based authentication in cloud computing. Very recently, Xiang and Tang [21] have proposed some efficient outsourcing schemes for modular exponentiations with checkability against untrusted cloud servers. Hsien et al. [10, 14] presented two surveys of public auditing for secure data storage in cloud computing. The computation of bilinear pairing represents most of the computing cost when dealing with pairing-based cryptographic protocols. In recent, Chen et al. [4] have put forth a new outsourcing algorithm for bilinear pairings in two untrusted programs model. In this paper, we argue that the SAV-BLS-1 scheme is artificial because the delegated computations do not represent the heavier computation part; the verification procedure should therefore be rather performed solely by the verifier himself. What appears to ...