First Scheme Research Articles

Probably Secure Keyed-Function Based Authenticated Encryption Schemes for Big Data

Security, privacy and data integrity are the critical issues in Big Data application of IoT-enable environment and cloud-based services. There are many upcoming challenges to establish secure computations for Big Data applications. Authenticated encryption (AE) plays one of the core roles for Big Data’s confidentiality, integrity, and real-time security. However, many proposals exist in the research area of authenticated encryption. Generally, there are two concepts of nonce respect and nonce reuse under the security notion of the AE. However, recent studies show that nonce reuse needs to sacrifice security bound of the AE. In this paper, we consider nonce respect scheme and probabilistic encryption scheme which are more efficient and suitable for big data applications. Both schemes are based on keyed function. Our first scheme (FS) operates in parallel mode whose security is based on nonce respect and supports associated data. Furthermore, it needs less call of functions/block-cipher. On the contrary, our second scheme is based on probabilistic encryption. It is expected to be a light solution because of weaker security model construction. Moreover, both schemes satisfy reasonable privacy security bound.

Variable message encryption through blockcipher compression function

SummaryA constrained device is an emerging technology that has enormous applications in our daily life such as access control, inventory control, luggage tracking, bar‐code reader, and IoT. However, it has certain drawbacks of low memory and less computing power. Thus, one of the cracking challenges is to provide efficient and secure cryptographic solution for the constrained device in the aspect of security issue. An (n,n) blockcipher‐based cryptographic compression function is applicable to provide provable security to the constrained device. Though, there are many constructions of (n,n) blockcipher such as MDC‐2, MDC‐4, MJH, Bart‐12, and SKS‐15. However, most of the familiar schemes are not suitable for short and variable message encryption without padding because of their internal structures. Furthermore, the security margin is provided based on blocklength rather than the flexible size of message. In this paper, we present two different (n,n) blockcipher compression function schemes. The first scheme (FS) satisfies better efficiency such as less call of blockcipher, less key scheduling, and higher efficiency rate. On the contrary, the second scheme (SS) has upper security bound. Moreover, both of the schemes are suitable for small and variable message encryption (message size = tn|t < 1,n:blocklength), which is handy for the constrained device. The collision and preimage security bound of the FS are O(2tn/2) and O(2tn). In addition, the SS's collision resistance and preimage resistance are bounded by O(2tn) and O(22tn). Moreover, the efficiency rate of the proposed two schemes are respectively t and t/3. The numbers of key scheduling are 2 for the constructions of FS and SS. We use two calls of blockcipher in the FS. On the contrary, three calls of blockcipher are used in the SS. Copyright © 2016 John Wiley & Sons, Ltd.

Daylight Transmission Analysis In Experimental Building Envelope Assemblies

In light of the fact that building envelope design and construction are critical for building performance as well as the fact that architects and engineers rarely collaborate in the early phases of design processes, the Facade Laboratory at The University of Texas at Austin was established. The laboratory exists as a physical chamber to allow testing in the areas of daylighting, thermal exchange, ventilation, and the use of direct and indirect solar energy. The full-scale size of the Facade Laboratory helps provide particularly accurate data, as the prediction of a structure’s lighting and thermal behavior is inherently dependent on the use of real-scale testing facilities. Simultaneously, the data collected through experimentation with the Facade Laboratory is used in the calibration of energy simulation software. Physical facade mock-up tests inspire new speculative simulated tests and vice versa. An initial shading structure, Prototype 1, was designed, built, and tested virtually and physically. A second scheme, Prototype 2, tested only virtually thus far, expands upon the fi rst scheme by proposing speculative hybrid light/ventilation fi lters which incorporate passive daylight to optimize building energy consumption, thus allowing for improved interior lighting conditions while simultaneously creating improved indoor air quality. The Facade Laboratory offers the opportunity to develop an integrated approach to problem solving by an interdisciplinary team of architectural and engineering students as well as professionals. Initial facade construction design and mock-up experiments as well as corollary virtual experiments have yielded interesting qualitative and quantitative results, warranting a larger discussion regarding their implications.