Authenticated Digital Currency Redaction with Stronger Privacy and Usability

With the promotion of digital currency,how to effectively solve the authenticity,privacy and usability of digital currency issuance has been a key problem.Redactable signature scheme(RSS)can provide the verification of the integrity and source of the generated sub-documents and solve the privacy problem in digital currency by removing blocks from the signed documents.Unfortunately,it has not realized the consolidation of signed documents,which can not solve the problem of merging two digital currencies.Now,we introduce the concept of weight based on the threshold secret sharing scheme(TSSS)and present a redactable signature scheme with merge algorithm(RSS-MA)using the quasi-commutative accumulator.Our scheme can reduce the communication overhead by utilizing the merge algorithm when transmitting multiple digital currency signatures.Furthermore,this can effectively hide the scale of users’private monetary assets and the number of transactions between users.While meeting the three properties of digital currency issuance,in order to ensure the availability of digital currency after redacting,editors shall not remove the relevant identification information block form digital currency.Finally,our security proof and the analysis of efficiency show that RSS-MA greatly improves the communication and computation efficiency when transmitting multiple signatures.

Digital Text DocumentWatermarking Based Tampering Attack Detection via Internet

Owing to the rapid increase in the interchange of text information through internet networks,the reliability and security of digital content are becoming a major research problem.Tampering detection,Content authentication,and integrity verification of digital content interchanged through the Internet were utilized to solve a major concern in information and communication technologies.The authors’difficulties were tampering detection,authentication,and integrity verification of the digital contents.This study develops an Automated Data Mining based Digital Text Document Watermarking for Tampering Attack Detection(ADMDTW-TAD)via the Internet.The DM concept is exploited in the presented ADMDTW-TAD technique to identify the document’s appropriate characteristics to embed larger watermark information.The presented secure watermarking scheme intends to transmit digital text documents over the Internet securely.Once the watermark is embedded with no damage to the original document,it is then shared with the destination.The watermark extraction process is performed to get the original document securely.The experimental validation of the ADMDTW-TAD technique is carried out under varying levels of attack volumes,and the outcomes were inspected in terms of different measures.The simulation values indicated that the ADMDTW-TAD technique improved performance over other models.

A Novel Video Data-Source Authentication Model Based on Digital Watermarking and MAC in Multicast

A novel video data authentication model based on digital video watermarking and MAC （message authentication code） in multicast protocol is proposed in this paper, The digital watermarking which composes of the MAC of the significant vid eo content, the key and instant authentication data is embedded into the insignificant video component by the MLUT （modified look-up table） video watermarking technology. We explain a method that does not require storage of each data packet for a time, thus making receiver not vulnerable to DOS （denial of service） attack. So the video packets can be authenticated instantly without large volume buffer in the receivers. TESLA （timed efficient stream loss tolerant authentication） does not explain how to select the suitable value for d, which is an important parameter in multicast source authentication. So we give a method to calculate the key disclosure delay （number of intervals）. Simulation results show that the proposed algorithms improve the performance of data source authentication in multicast.

Design and Implementation of Secure and Reliable Information Interaction Architecture for Digital Twins

In order to improve the comprehensive defense capability of data security in digital twins(DTs),an information security interaction architecture is proposed in this paper to solve the inadequacy of data protection and transmission mechanism at present.Firstly,based on the advanced encryption standard(AES)encryption,we use the keystore to expand the traditional key,and use the digital pointer to avoid the key transmission in a wireless channel.Secondly,the identity authentication technology is adopted to ensure the data integrity,and an automatic retransmission mechanism is added for the endogenous properties of the wireless channel.Finally,the software defined radio(SDR)platform composed of universal software radio peripheral(USRP)and GNU radio is used to simulate the data interaction between the physical entity and the virtual entity.The numerical results show that the DTs architecture can guarantee the encrypted data transmitted completely and decrypted accurately with high efficiency and reliability,thus providing a basis for intelligent and secure information interaction for DTs in the future.

Ensuring the Authenticity and Non-Misuse of Data Evidence in Digital Forensics

In forensic investigations,it is vital that the authenticity of digital evidence should be ensured. In addition,technical means should be provided to ensure that digital evidence collected cannot be misused for the purpose of perjury. In this paper,we present a method to ensure both authenticity and non-misuse of data extracted from wireless mobile devices. In the method,the device ID and a timestamp become a part of the original data and the Hash function is used to bind the data together. Encryption is applied to the data,which includes the digital evidence,the device ID and the timestamp. Both symmetric and asymmetric encryption systems are employed in the proposed method where a random session key is used to encrypt the data while the public key of the forensic server is used to encrypt the session key to ensure security and efficiency. With the several security mechanisms that we show are supported or can be implemented in wireless mobile devices such as the Android,we can ensure the authenticity and non-misuse of data evidence in digital forensics.

Encrypted Sensing Based on Digital Holography for Fingerprint Images

We propose a novel biometric sensing technique for personal authentication in which fingerprint images are captured using an optical encryption method. This method can reduce the risk of data theft or leakage of personal information captured by biometric sensing. This method, termed encrypted sensing, is implemented using digital holography with double random phase encoding. We demonstrate experimentally that a fingerprint image can be captured as an optically encrypted image and can be restored correctly only when the correct cipher key is used. Moreover, we investigate experimentally the verification accuracy of the decrypted images.

A Digital Right Management Model for Distribution of Digital Audiovisual Content

This paper presents a digital rights management model, which considers the integrated factors including legality, communication security, integrity of the content, and trading fairness. The architecture of the model, the necessary protocol for the copyright control and content distribution, the authentication mechanism which offer consumption registration for content fair distribution, of the model are all provided. The scheme also provides distribution and evidence for using the copyright of digital content fairly and effectively. Finally, analysis shows the proposed model has both high security and good performance.

Two Improved Digital Signature Schemes

In this paper, two improved digital signature schemes are presented based on the design of directed signature scheme. The peculiarity of the system is that only if the scheme is specific recipient, the signature is authenticated. Since the scheme adds the screen of some information parameters, the difficulty of deciphered keys and the security of digital signature system are increased.

A Secure Public-key Image Authentication Plan

Digital watermark can be used for image ownership verification orauthentication. In this paper, we propose a new image authentication plan concentrating on itssecurity performance. Digital watermark is first turbo coded, sealed and then processed. In waveletdomain. To enhance security level, public key cryptosystem is utilized to replace traditionalwatermark key. Simulation results are finally given by experiment.

Hybrid Authentication Cybersystem Based on Discrete Logarithm, Factorization and Array Entanglements

A hybrid cryptographic system providing digital authentication is described and analyzed in this paper. The proposed cryptosystem incorporates three features: complexity of the discrete logarithm problem, complexity of integer factorization of a product of two large primes and a combination of symmetric and asymmetric keys. In order to make the cryptosystem less vulnerable to cryptanalytic attacks a concept of digital entanglements is introduced. As a result, the proposed cryptographic system has four layers (entanglement-encryption- decryption-disentanglement). It is shown that in certain instances the proposed communication cryptocol is many times faster than the RSA cryptosystem. Examples provided in the paper illustrate details of the proposed authentication cryptocol.

An online identity authentication method for blood smear

Blood smear test is the basic method of blood cytology and is also a standard medical test that can help diagnose various conditions and diseases.Morphological examination is the gold stan-dard to determine pathological changes in blood cell morphology.In the biology and medicine automation trend,blood smears'automated management and analysis is very necessary.An online blood smear automatic microscopic image detection system has been constructed.It includes an online blood smear automatic producing part and a blood smear automatic micro-scopic image detection part.Online identity authentication is at the core of the system.The identifiers printed online always present dot matrix digit code(DMDC)whose stroke is not continuous.Considering the particularities of DMDC and the complexities of online application environment,an online identity authentication method for blood smear with heterological theory is proposed.By synthesizing the certain regional features according to the heterological theory,high identification accuracy and high speed have been guaranteed with few features required.In the experiment,the suficient correct matches bet ween the tube barcode and the identification result verified its feasibility and validity.

OvBNN authentication based on cooperative signature for wireless sensor networks

The universality of the application of wireless sensor networks( WSN) makes more attention be paid on the security problem. Node authentication is not only the basis of network security,but also the premise of key management and secure routing protocol. Although the signature mechanism based on symmetric encryption is high in energy efficiency,it is vulnerable to be attacked and there is a time delay during authentication. Traditional public key encryption mechanism with improvement in security brings in complex algorithm and costs much time,which is not suitable for WSN. In this paper,a signature authentication mechanism,an optimized variant Bellare Namprempre Neven( OvBNN) is presented to quickly complete the authentication by mutual cooperation between nodes so as to make the nodes use the intermediate calculation results of their neighbor nodes directly.Simulation results show that the proposed mechanism is superior to traditional authentication mechanisms both in energy consumption and authentication time.

A Distributed Secure Mechanism for Resource Protection in a Digital Ecosystem Environment

The dynamic interaction and collaboration of the loosely coupled entities play a pivotal role for the successful implementation of a Digital Ecosystem environment. However, such interaction and collaboration can only be promoted when information and resources are effortlessly shared, accessed, and utilized by the interacting entities. A major requirement to promote an intensive sharing of resources is the ability to secure and uphold the confidentiality, integrity and non-repudiation of resources. This requirement is extremely important in particular when interactions with the unfamiliar entities occur frequently. In this paper, we present a distributed mechanism for improving resource protection in a Digital Ecosystem environment. This mechanism can be used not only for any secure and reliable transaction, but also for encouraging the collaborative efforts by the Digital Ecosystem community members to play a major role in securing the environment. Public Key Infrastructure is also employed to provide a strong protection for its access workflows.

A compression tolerant scheme for image authentication

Image authentication techniques used to protect the recipients against malicious forgery. In this paper, we propose a new image authentication technique based on digital signature. The authentication is verified by comparing the features of the each block in tested image with the corresponding features of the block recorded in the digital signature. The proposed authentication scheme is capable of distinguishing visible but non-malicious changes due to common processing operations from malicious changes. At last our experimental results show that the proposed scheme is not only efficient to protect integrity of image, but also with low computation, which are feasible for practical applications.

Anonymous Authentication for Secure Mobile Agent Based Internet Business

Nowadays, mobile agents are an effective paradigm for accessing the information in distributed applications, especially in a dynamic network environment such as Internet businesses. In such kind of Internet based applications, access must be secure and authentication takes a vital role to avoid malicious use of the system. This kind of security has been provided by several previously proposed algorithms based on RSA digital signature cryptography. However, the computational time for performing encryption and decryption operations in the past literatures is very high. In this paper, we propose an anonymous authentication scheme which potentially reduces the overall computation time needed for verifying the legitimacy of the users. Comparing with previous anonymous authentication schemes, our proposed scheme provides more security and it is effective in terms of computation cost. The experimental results show that the proposed method authenticates the users with low computational time significantly.

Dual Authentication Hashing for Security Enhancement in MANET

Mobile Ad hoc Network (MANET) is a collection of mobile hosts with wireless interfaces that form a temporary network without the aid of any fixed infrastructure or centralized administration. A MANET is a type of ad hoc network that can change locations and configure itself on the fly. The dynamic and cooperative behaviour of ad hoc networking without any centralized or unified controlling authority for authentication and monitoring is sensitive to attacks that damage or exploit the cooperative behaviour of ad hoc routing. Routing attacks lead to the most disastrous damage in MANET. The main objective of this paper is to enhance the security against routing attacks in MANETs. Intrusion detection based on DAHT (Dual Authentication Hash Technique) entirely depends on the end to end communication between the source and destination is employed here. The proposed technique identifies the misbehaving nature of current node and the previous node where it receives the information. DAHT is simulated with various parameters in NS2. The results obtained are compared with existing mechanism. The results show that malicious detection, overhead reduction and delay are better when compared to the existing system that is employed in protecting the routing information.

Content Authentication Based on JPEG-to-JPEG Watermarking

A content authentication technique based on JPEG-to-JPEG watermarking is proposed in this paper. In this technique, each 8x8 block in a JPEG compressed image is first processed by entropy decoding, and then the quantized discrete cosine transform （DCT） is applied to generate DCT coefficients： one DC coefficient and 63 AC coefficients in frequency coefficients. The DCT AC coefficients are used to form zero planes in which the watermark is embedded by a chaotic map. In this way, the watermark information is embedded into JPEG compressed domain, and the output watermarked image is still a JPEG format. The proposed method is especially applicable to content authentication of JPEG image since the quantized coefficients are modified for embedding the watermark and the chaotic system possesses an important property with the high sensitivity on initial values. Experimental results show that the tamper regions are localized accurately when the watermarked JPEG image is maliciously tampered.

数字图像多功能水印综述

数字图像多功能水印技术通过将多种类型的水印嵌入到同一图像,以实现2种及以上的图像保护功能(版权保护、内容认证、篡改恢复等).当前,数字图像多功能水印算法仍面临着性能和应用场景等方面的挑战.为促进图像多功能水印的进一步发展,首先系统地梳理了数字图像水印技术,包括其系统特性、常见分类、关键技术与成果,以及其可实现的功能与应用场景;在此基础上,对近10年来不同类别的多功能水印嵌入模型(融合水印嵌入、零水印嵌入、水印串行嵌入、水印并行嵌入)的相关工作进行归纳与分析;最后,总结了当前数字图像多功能水印技术的不足,展望了后续研究与发展趋势.综合分析发现,多水印的嵌入难免对水印综合性能造成损失,且多功能水印在真实应用场景中的效果仍待改善.人工智能等新技术在数字图像多功能水印中的应用有望提升算法性能.

人·真·能:数智时代通识教育的三个关键词

人类社会进入数智时代,知识的生产、传播和应用都发生了巨大的变化,教育理念和实践需要与社会和技术同步迭代。数智时代的通识教育,以“人”为第一关键词,塑造博雅、整全之人,人才培养既是起点也是目标。数智时代,推进“真”的通识教育,须走出将“通识”等同于“通俗”、将“通识”与“专业”对立以及“伪通识教育”等误区,培养学生枇判性思维和提出问题、解决问题的能力。数智理念及技术,能够同时为教师和学生赋“能”,有助于通识教育的去伪存真,完成大学教育提升人的智能和德性的使命。

统一身份认证技术在高校数字化校园中的应用

常规的高校数字化校园身份认证技术利用最低有效位生成隐藏矩阵,需要多用户完成,导致其信息隐藏容量不足,因此需要提出一个新的高校数字化校园身份认证技术。先建立统一身份数据库,根据数据库设定身份认证目标逻辑指令,再构建循环认证模式,最后生成高校数字化校园身份认证。实验结果表明,设计的高校数字化校园身份认证技术安全性较高,认证效果较好,可以有效地抵御众多已知的安全威胁,具有一定的应用价值。