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A hash Approach to Refine CNC Computation of Arc Length and Parameter of NURBS with High Efficiency and Precision

INTERNATIONAL JOURNAL OF PRECISION ENGINEERING AND MANUFACTURING 2024年第6期25卷 1243-1256页

作者： Han, Xueting Zhu, Kongfeng Wang, Xingbo Foshan Univ Dept Mechatron 33 Guangyun Rd Foshan 528000 Guangdong Peoples R China GSK CNC Equipment Co Ltd R&D 22 Guanda Rd Guangzhou 510000 Guangdong Peoples R China Guangdong Coll Appl Sci & Technol Dept Intelligent Manufacture 20 Fengle Rd Zhaoqing 526000 Guangdong Peoples R China

A hash method is proposed to compute bi-directionally the arc length and the parameter of the NURBS curve in curve interpolation. By using a hash table that adopts a doubly linked circular list and a red-black tree, the method first computes the arc lengths corresponding to each initial knot value and stores the computed results in the hash table by means of an ingenious searching-and-computing technique. With the fast search capability of the hash algorithm, the stored data can be rapidly located to form a tiny interval for computing either the arc length or the parameter, greatly shortening the computation period and highly improving the computational precision. Experiments show that the proposed method is tens or even thousands of times more rapid and precise than the classical ones and is helpful to develop high-performance interpolators.

关键词： NURBS interpolation Arc length Knot parameter hash algorithm

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Changes in Federal Information Processing Standard (FIPS) 180-4, Secure hash Standard

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CRYPTOLOGIA 2013年第1期37卷 69-73页

作者： Dang, Quynh NIST Comp Secur Div 773 Informat Technol Lab Gaithersburg MD 20899 USA

This article describes the changes between Federal Information Processing Standards FIPS 180-3 and FIPS 180-4. FIPS 180-4 specifies two new secure cryptographic hash algorithms: secure hashing algorithms SHA-512/224 and SHA-512/256;it also includes a method for determining initial value(s) for any future SHA-512-based hash algorithm(s). FIPS 180-4 also removes a requirement for the execution of the message length encoding operation.

关键词： FIPS 180 hash algorithm hash function SHA-512 SHA-512 224 SHA-512 256

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A novel chaotic hash-based attribute-based encryption and decryption on cloud computing

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INTERNATIONAL JOURNAL OF ELECTRONIC SECURITY AND DIGITAL FORENSICS 2018年第1期10卷 1-19页

作者： Tamma, Lakshmi Naga Divya Ahamad, Shaik Shakeel KL Univ Dept CSE Guntur India Majmaah Univ CCIS Riyadh Saudi Arabia

Cloud computing has evolved as widely accepted and used paradigm for service providers as well as customers on internet. As users share their sensitive information on cloud, it has become the major concern of the cloud service providers to make their environment more secure and trustworthy. For adding extended security, the sensitive data are needed to be encrypted prior to its upload on cloud. The numbers of cryptographic algorithms are proposed by various researchers for this purpose. The main objectives of the attribute-based encryption (ABE) models are to achieve security and access control. To resolve the issue of this conventional attribute-based model, a novel modified and extended hash-based ABE model was implemented on the cloud storage data. Experimental results proved that the proposed model has high computational accuracy compared to traditional ABE models in terms of time and data size concerned.

关键词： attribute-based encryption ABE cloud security hash algorithm cipher-text policy attribute-based encryption CPABE key policy attribute-based encryption KPABE

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HTIME: A hash-Based Terminal Identification Method in Cloud Environment 12

HTIME: A Hash-Based Terminal Identification Method in Cloud ...

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IEEE Int Congr on Cybermat / 12th IEEE Int Conf on Cyber, Phys and Social Comp (CPSCom) / 15th IEEE Int Conf on Green Computing and Communications (GreenCom) / 12th IEEE Int Conf on Internet of Things (iThings) / 5th IEEE Int Conf on Smart Data

作者： Liu, Bowen Jiang, Xutong Song, Zhang Liu, Jiabang Dou, Wanchun Northeastern Univ Dept Software Shenyang Peoples R China Nanjing Univ State Key Lab Novel Software Technol Nanjing Peoples R China

ISBN: (纸本)9781728129808

In mobile computing environment, it is a key issue to ensure the security of a user when he/she visits a cloud service by his/her smart terminal. Generally speaking, the existing techniques, e.g. biometric technique, human activity recognition, focus on protecting users' security through collecting a large number of users' behavior data. It often results in a risk of privacy disclosure. In view of this challenge, a hash-based Terminal Identification Method, named HTIME, is proposed in this paper, which is deployed with a few user behavior data. At last, a real and typical scenario is discussed to verify the feasibility and efficiency of the approach.

关键词： cloud environment terminal verify privacy security hash algorithm

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Hybrid open hash tables for network processors

Hybrid open hash tables for network processors

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IEEE Workshop on High Performance Switching and Routing (HPSR 2005)

作者： Ye, Q Parson, D Cheng, L Lehigh Univ Dept Comp Sci & Engn Lab Networking Grp LONGLAB Bethlehem PA 18015 USA

ISBN: (纸本)0780389247

Packet classification by analyzing the traffic header information is an essential task of network processors. To efficiently store, retrieve and update information, key-based data accessing algorithms such as hashing are usually used to improve the processing performance. In this paper, we propose the hybrid open hash, a composite algorithm that combines open addressing hash tables with the temporal responsiveness of incremental garbage collection. By dynamically switching between a novel table with increment;, construction via selective copying of used entries, and an aged table with incremental cleaning via emptying of deleted entries, this algorithm solves the structural problem of conventional open hashing due to remnants left by deleted keys. Thus, it increases the data accessing speed. We also implement and compare our algorithm with Brutil, the latest proposed hashing mechanism designed for real-time embedded systems, from the concurrency issue of multithreading to the performance simulation by taking the real traffic information to construct hashed keys. Our results show that hybrid open hash has better performance. Several possible enhancement approaches are also discussed to improve the performance further.

关键词： garbage collection hash algorithm network processor

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A novel chaotic encryption scheme based on image segmentation and multiple diffusion models

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OPTICS AND LASER TECHNOLOGY 2018年 108卷 558-573页

作者： Wang, Mingxu Wang, Xingyuan Zhang, Yingqian Gao, Zhenguo Dalian Univ Technol Sch Elect & Informat Engn Dalian 116024 Peoples R China Dalian Maritime Univ Sch Informat Sci & Technol Dalian 116026 Peoples R China Xiamen Univ Tan Kah Kee Coll Sch Informat Sci & Technol Zhangzhou 363105 Peoples R China

Based on image segmentation and multiple diffusion models, a novel chaotic encryption scheme is proposed in this paper. Firstly, a random key is generated to calculate the initial value and control parameter of chaotic map. Secondly, the SHA-512 hash algorithm is used to compute a hash array based on plain image, which is used as secret keys. Finally, according to parts values of that array, an image are divide into sub-blocks and some diffusion model are selected respectively. It is proved by simulation results and security analysis that the proposed scheme has a better security and can withstand common attacks. (C) 2018 Elsevier Ltd. All rights reserved.

关键词： Chaotic map hash algorithm Permutation and diffusion Security analysis Image encryption

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A combined chaotic cryptographic and hashing scheme

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PHYSICS LETTERS A 2003年第5-6期307卷 292-298页

作者： Wong, KW City Univ Hong Kong Dept Comp Engn & Informat Technol Kowloon Hong Kong Peoples R China

Recently, we have proposed a fast chaotic cryptographic scheme based on iterating a logistic map with the look-up table updated dynamically. We found that after the whole encryption process, the final look-up table strongly depends on the message and so it can be considered as its hash value or message authentication code. In this Letter, we generalize the chaotic cryptographic scheme so that it can perform both encryption and hashing to produce the cipher text as well as the hash value for a given message. The collision resistance of the proposed hashing approach is also analyzed. (C) 2002 Elsevier Science B.V. All rights reserved.

关键词： chaos cryptography logistic map hash algorithm

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Dynamical analysis of four-dimensional chaotic system and its application in image encryption

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MULTIMEDIA TOOLS AND APPLICATIONS 2023年第14期82卷 21509-21534页

作者： Yan, Shaohui Gu, Binxian Ren, Yu Sun, Xi Wang, Ertong Northwest Normal Univ Coll Phys & Elect Engn 967 Anning East Rd Lanzhou 730070 Gansu Peoples R China Gansu Intelligent Informat Technol & Applicat Eng Lanzhou 730070 Gansu Peoples R China

In this paper, a phase diagram of a four-dimensional chaotic system is established by introducing cosine function into Lorenz system. Then 0-1 test, complexity, and offset boosting, National Institute of Standards and Technology (NIST) test is conducted on the pseudo-random sequence generated by the system. Result shows that the system is suitable for image encryption. Combining with the proposed system, an image encryption algorithm based on hash and deoxyribonucleic acid (DNA) is designed. In this algorithm, through the plaintext hash value generated by the system initial values and the number of iterations to generate chaos sequence. By reordering the sequence of indexes to scrambling plaintext. In the diffusion module, we use XOR and cyclic left shift to get the final ciphertext. After simulation and security analysis, the algorithm has good encryption efficiency and security. It can resist most common attacks.

关键词： Chaotic system Offset boosting hash algorithm DNA Bit cyclic shift

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Optimized data storage algorithm of IoT based on cloud computing in distributed system

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COMPUTER COMMUNICATIONS 2020年 157卷 124-131页

作者： Wang, Mingzhe Zhang, Qiuliang China Acad Railway Sci Beijing 100081 Peoples R China

The existing Internet of Things(IoT) uses cloud computing data access storage algorithms, that is, the hash algorithm has defects of low data processing efficiency and low fault tolerance rate. Therefore, HDFS is introduced to optimize cloud computing data access storage algorithms. HDFS is first used to optimize the data access storage architecture according to problems of data access storage architecture in the Internet of Things, in which factors of data access storage distribution in the IoT are fully considered, and hash values are used to optimize the configuration of data access information storage locations, so that data access storage distribution strategy can be optimized. Then, the topology of the IoT is optimized, and data block size is also optimized with effect algorithm. Finally, the design of file storage is optimized. Through simulation experiments, it is proved that the optimized cloud storage method has obvious performance advantages in file read and write speed as well as memory usage. Compared with the traditional hash algorithm, optimization algorithm proposed in the paper greatly improves file upload and download efficiency, data processing efficiency and fault tolerance rate, which fully demonstrates that the proposed cloud computing data access storage optimization algorithm is more superior.

关键词： Cloud computing Data access Storage hash algorithm Network topology

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An efficient dual-stage pixel-diffusion based multimedia-image encryption using one-type 1D chaotic maps

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SADHANA-ACADEMY PROCEEDINGS IN ENGINEERING SCIENCES 2022年第3期47卷 1-25页

作者： Patro, K. Abhimanyu Kumar Kumar, Maddikuntla Praveen Acharya, Bibhudendra Manipal Acad Higher Educ Manipal Inst Technol Dept Mechatron Manipal 576104 Karnataka India Natl Inst Technol Raipur Dept Elect & Commun Engn Raipur 492010 Chhattisgarh India

Multimedia is an appealing and interactive information representation using a mixture of images, text, audios, and videos. In many cases, people are using images more often than text to represent the information. This is because people do not like to read large amounts of textual content. Multimedia-images are widely used in military intelligence, satellite imagery, education, business presentations, secret documentations, etc. Security is therefore a major concern nowadays for storing and transmitting these multimedia-images. There are many algorithms that have been proposed in recent times to attain security. This paper presents a dual-stage pixel-diffusion protection image encryption method based on one-type one-dimensional (1D) chaotic maps. The two-stage diffusion process diffuses pixels twice and thus increases the algorithm's security. The proposed algorithm is stronger than the encryption algorithms based on the one-stage diffusion process. The proposed technique initially performs pixel-permutation operation in the individual components of colour images (red, green, and blue) and then conducts twice-diffusion operations (ADD and Exclusive-OR) in the individual components. The performance of the suggested method is evaluated using key space, histogram variance, adjacent pixel correlation, information entropy, differential attack, and computational complexity analyses. The key space of the proposed approach is 70.62% greater than that of the comparative method, which has the greatest key space. Like key space, the proposed strategy has a 4.91% lower histogram variance and 75% lower adjacent pixel correlations in encrypted images than the comparison methods, which has the lowest histogram variance and adjacent pixel correlations. The proposed scheme's information entropy is just 0.0013% lower than the comparison technique, which has a greater information entropy. The proposed scheme's average NPCR (Number of Pixel Changing Rate) and UACI (Unified Average Chang

关键词： Cryptography information security multimedia-image image encryption one-dimensional chaos hash algorithm

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