24 research outputs found
Spot the Difference: Your Bucket is Leaking : A Novel Methodology to Expose A/B Testing Effortlessly
No full textA/B testing - also known as bucket testing - allows an organization to evaluate the performance/impact of new features implemented on their website by exposing a small fraction of visitors to them. In this paper, we propose a novel methodology that can reveal an ongoing bucket testing and the various features being tested. To evaluate the effectiveness of our proposed methodology, we began with testing the homepages of seven popular websites. We discover that four of them were actively performing bucket testing during our experiments, and we successfully spot different features being tested. Moreover, to investigate the factors that might affect bucket testing, we setup another experiment. Here, we request web pages from different browsers and record several features of server response, e.g. cookies set by the server, IP and port address of the responding server, and response time. We observe variations in the response time for different browsers, which suggest that the type of user agent plays an important role. Finally, we showcase the captured bucket-elements and release our dataset that can serve as ground truth for future investigations in this direction of research. © 2018 IEEE
Emergency access control management via attribute based encrypted QR codes
No full textIn dynamic environments such as disaster management, mechanisms for the controlled override of access restrictions, a.k.a. break-glass need to be supported. These access control mechanisms should ensure access to facilities, for example, an office building, in an emergency situation, without relying on the use of an online authentication server as connectivity might not be available. In this paper, we propose a break-glass access control mechanism based on a novel use of QR codes, Shamir's Secret Sharing Scheme and Attribute Based Encryption. Our proposed solution is such that a secret access key is split using Shamir's secret sharing scheme and encrypted using attribute based encryption, then encoded in a QR code. Subsequently, emergency actors scan the QR code and recover the individual secret key using their attributes satisfying an access policy associated with the ciphertext. The novelty of our solution lies in the fact that a flexible access control is ensured only when a sufficient number of authorized users collaborate to get access to a building without requiring an online third party. In addition, the access secret key is only decrypted by the authorized users thanks to the use of an attribute based encryption scheme. Finally, we demonstrate the feasibility and the efficiency of the solution by implementing a prototype and analysing its performance
A coefficient inequality for a subclass of the Carathéodory functions defined using conical domains
No full textAbstractFor 0≤k<∞, let Ωk be the conical domain in the complex plane C defined by Ωk={w∈C:w=u+iv,u2>k2((u−1)2+v2),u>0}. Let qk(z) be the Riemann map of U:={z∈C:|z|<1} onto Ωk satisfying qk(0)=1,qk′(0)>0. Let P(qk) be the class of analytic functions h(z) subordinate in U to qk(z) and represented by h(z)=1+b1z+b2z2+⋯, (z∈U). Sharp estimates for |b2−ub12|(−∞<u<∞) are found in this note. This result improves upon an estimate of Kanas in terms of both bounds and ranges of the parameter u [S. Kanas, Coefficient estimates in subclasses of the Carathéodory class related to conical domains, Acta Math. Univ. Comenianae LXXIV 2 (2005) 149–161]
Importance of Understanding Scientific Misconduct & the Ways to Curb the Practice in Social Science Research in the 21st Century
No full textFor the development of any nation, there is more requirement for quality research. With the growing age, science & technologies are also growing day by day and help us in every sphere of the society. These technologies are playing a vital role in research & development. As we all know, research is a systematic and scientific process in which all things are done according to the code & conduct of the science. In the present paper, the author will discuss scientific misconduct, which is otherwise known as research misconduct, and how it is essential to understand scientific misconduct in the 21st century. The author will be going to discuss how we can eliminate research misconduct by explaining the strategies of the UGC’s (University Grants Commission) initiatives in India to curb the practice of scientific misconduct at the institution level and also at the journal & publisher level
Coefficient estimates for a certain subclass of analytic and bi-univalent functions
No full textAbstractIn this paper, we introduce and investigate an interesting subclass HΣh,p of analytic and bi-univalent functions in the open unit disk U. For functions belonging to the class HΣh,p, we obtain estimates on the first two Taylor–Maclaurin coefficients |a2| and |a3|. The results presented in this paper would generalize and improve some recent work of Srivastava et al. [H.M. Srivastava, A.K. Mishra, P. Gochhayat, Certain subclasses of analytic and bi-univalent functions, Appl. Math. Lett. 23 (2010) 1188–1192]
Applications of the Owa-Srivastava Operator to the Class of K-Uniformly Convex Functions
No full text2000 Mathematics Subject Classification: Primary 30C45, 26A33; Secondary 33C15By making use of the fractional differential operator Ω^λz (0 ≤ λ < 1) due
to Owa and Srivastava, a new subclass of univalent functions denoted by
k−SPλ (0 ≤ k < ∞) is introduced. The class k−SPλ unifies the concepts of
k-uniformly convex functions and k-starlike functions. Certain basic
properties of k − SPλ such as inclusion theorem, subordination theorem, growth
theorem and class preserving transforms are studied.* The present investigation is partially supported by National Board
for Higher Mathematics, Department of Atomic Energy, Government of
India under Grant No. 48/2/2003-R&D-I
Formal Modeling and Verification of a Blockchain-Based Crowdsourcing Consensus Protocol
No full textCrowdsourcing is an effective technique that allows humans to solve complex problems that are hard to accomplish by automated tools. Some significant challenges in crowdsourcing systems include avoiding security attacks, effective trust management, and ensuring the system’s correctness. Blockchain is a promising technology that can be efficiently exploited to address security and trust issues. The consensus protocol is a core component of a blockchain network through which all the blockchain peers achieve an agreement about the state of the distributed ledger. Therefore, its security, trustworthiness, and correctness have vital importance. This work proposes a Secure and Trustworthy Blockchain-based Crowdsourcing (STBC) consensus protocol to address these challenges. Model checking is an effective and automatic technique based on formal methods that is utilized to ensure the correctness of STBC consensus protocol. The proposed consensus protocol’s formal specification is described using Communicating Sequential Programs (CSP#). Safety, fault tolerance, leader trust, and validators’ trust are important properties for a consensus protocol, which are formally specified through Linear Temporal Logic (LTL) to prevent several security attacks, such as blockchain fork, selfish mining, and invalid block insertion. Process Analysis Toolkit (PAT) is utilized for the formal verification of the proposed consensus protocol
Second Hankel Determinant for a Class of Analytic Functions Defined by Fractional Derivative
No full textBy making use of the fractional differential operator Ωzλ due to Owa and Srivastava, a class of analytic functions ℛλ(α,ρ) (0≤ρ≤1, 0≤λ<1, |α|<π/2) is introduced. The sharp bound for the nonlinear functional |a2a4−a32| is found. Several basic properties such as inclusion, subordination, integral transform, Hadamard product are also studied
Third-Order Differential Subordination and Differential Superordination Results for Analytic Functions Involving the Srivastava-Attiya Operator
No full textIn this article, by making use of the linear operator introduced and studied by Srivastava and Attiya [16], suitable classes of admissible functions are investigated and the dual properties of the third-order differential subordinations are presented. As a consequence, various sandwich-type theorems are established for a class of univalent analytic functions involving the celebrated Srivastava-Attiya transform. Relevant connections of the new results presented here with those that were considered in earlier works are pointed out
