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共 177 条记录，以下是21-30 订阅

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Reverse analysis of Wangxin application based on android platform

Reverse analysis of Wangxin application based on android pla...

引用

2021 International Conference on Computer Application and Information security, ICCAIS 2021

作者： Shi, Yu Ni, Lulin Ji, Qingbing Science and Technology on Communication Security Laboratory Chengdu610041 China

ISBN: (纸本)9781510655218

Wangxin application is an instant messaging software launched by Alibaba Group that can support Windows, Android, and iOS operating systems, and its chat messages are stored in the local folders of smart terminals. In this paper, we study the encryption protocol of the Wangxin application and propose a reverse analysis scheme for the Wangxin application. Since the data encryption such as chat messages are stored in the database, we analyze the encryption mechanism of the local database in detail and give a decryption key extraction method based on dynamic binary instrumentation. Finally, through practical tests, our scheme can accurately extract the decryption key and restore the local database, providing a complete solution for the Wangxin application data forensics. © The Authors.

关键词： Android (operating system)

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Analysis of a New Improved AES S-Box Structure 5th

Analysis of a New Improved AES S-Box Structure

引用

5th International Conference on security and Privacy in New Computing Environments, SPNCE 2022

作者： Cheng, Rong Zhou, Yu Miao, Xudong Hu, Jianyong Science and Technology on Communication Security Laboratory Chengdu610041 China

ISBN: (纸本)9783031306228

S-boxes are very important nonlinear components in symmetric ciphers and have a great role in the security of cryptographic algorithms. In algorithm design, 4-bit and 8-bit S-boxes are most commonly used. The S-box of the AES is the best 8-bit S-box in terms of nonlinearity and differential uniformity at present. However, other properties are not the best. In this paper, we improve and propose a new algebraic structure that can be used to generate S-boxes with excellent performance. The main enhanced properties of the new S-boxes are: strict avalanche criterion (SAC), distance to SAC, the bit independence criterion (BIC), algebraic complexity, inverse algebraic complexity, and periodicity. After comparing with existing S-boxes, the properties of S-boxes proposed in this paper are the best. © 2023, ICST Institute for Computer sciences, Social Informatics and Telecommunications Engineering.

关键词： Cryptography

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Design and Implementation of Big Data Analysis Algorithm in Ciphertext Domain Based on Homomorphic Encryption 3

Design and Implementation of Big Data Analysis Algorithm in ...

引用

3rd International Conference on Applied Machine Learning, ICAML 2021

作者： Huang, Yun Fan Tang, Dian Hua Zhao, Wei Ren, Juan Yu, Xiao Peng Science and Technology on Communication Security Laboratory Chengdu610041 China

ISBN: (纸本)9781665421256

As a new technology emerging in the era of Internet big data, cloud computing has huge storage space and tough computing power, providing a solution for the analysis and processing of big data. However, with the concern of privacy disclosure, data analysis in plaintext can not meet the needs of privacy protection. Therefore, the data security issues in the process of cloud computing need to be solved. Homomorphic encryption technology has the characteristics of computing on encrypted data, which can provide security protection for privacy data in cloud computing. In this paper, combined with CKKS homomorphic encryption scheme, using two different packing encoding methods based on row encoding and column encoding, we design different ciphertext data analysis algorithm schemes, including ciphertext mean calculation, ciphertext variance calculation, ciphertext covariance matrix calculation, etc., to achieve privacy protection in the process of big data analysis. In the order of millions of data sets, the ciphertext data analysis can achieve second order response. At the same time, the ciphertext analysis algorithm proposed in this paper supports multi-dimensional sample data sets. The experimental results show that the ciphertext data analysis under 16-dimensional data sets reaches 23.49 seconds. © 2021 IEEE

关键词： Data privacy

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A General Model for Publicly Verifiable Secret Sharing 5th

A General Model for Publicly Verifiable Secret Sharing

引用

5th International Conference on Intelligent, Interactive Systems and Applications, IISA 2020

作者： Zhao, Wei Li, Feng Science and Technology on Communication Security Laboratory Chengdu610041 China

ISBN: (纸本)9783030637835

Publicly verifiable secret sharing (PVSS) is of remarkable significance for confidential data processing and storage in complex interactive systems. In this correspondence subtly deviating properties of preceding PVSS models are studied and a general PVSS model is proposed to satisfy possible requirements without ambiguity. The new model comprises a secret sharing algorithm, a secret recovering algorithm, cryptosystems for shareholders and relative zero-knowledge protocols. Two kinds of security for PVSS are formally defined: all-or-nothing security and indistinguishability security. It is also justified that the zero-knowledge protocol in the distribution phase does not influence security for the new PVSS model. © 2021, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Digital storage

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Differential-Linear Cryptanalsis on SIMECK32/64 and SIMON32/64 3

Differential-Linear Cryptanalsis on SIMECK32/64 and SIMON32/...

引用

3rd International conference on Computer, Big Data and Artificial Intelligence, ICCBDAI 2022

作者： Zhang, Feng Li, Feng Zhang, Wenzheng Science and Technology on Communication Security Laboratory Sichuan Chengdu610041 China

In this paper, we give differential-linear cryptanalysis of SIMON, which is a family of lightweight block ciphers published by the National security Agency, and SIMECK, which is a family of lightweight block ciphers proposed by Yang et al. Firstly, all input difference and output masks with one active bit are traversed to obtain a 9-round SIMON32/64 differential-linear distinguisher and a 10-round SIMECK32/64 differential-linear distinguisher. Then, a 12-round SIMON32/64 differential-linear distinguisher with bias 2-12.69 and a 13-round SIMECK32/64 differential-linear distinguisher with bias 2-14.03 can be obtained by searching one round of differential characteristics forward and two rounds of linear approximations backward. The dynamic key guessing technique proposed by Wang et al. has excellent advantages in the SIMON-like cipher key recovery process. Therefore, we have applied it to differential-linear cryptanalysis. Then, the 12-round SIMON32/64 differential-linear distinguisher is extended forward by four rounds and backward by four rounds to attack the 20-round SIMON32/64 with time complexity 255.68 and data complexity 228. And the 13-round SIMECk32/64 differential-linear distinguisher is extended forward by four rounds and backward by four rounds to attack the 21-round SIMECK32/64 with time complexity 250.67 and data complexity 230. These are the best differential-linear cryptanalysis results for SIMON32/64 and SIMECK32/64 in the open literature. © Published under licence by IOP Publishing Ltd.

关键词： Cryptography

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Efficient Two-Party Authentication Key Agreement Protocol Using Reconciliation Mechanism from Lattice 5th

Efficient Two-Party Authentication Key Agreement Protocol Us...

引用

5th International Conference on security and Privacy in New Computing Environments, SPNCE 2022

作者： Wang, Jinhua Chen, Ting Liu, Yanyan Zhou, Yu Dong, XinFeng Science and Technology on Communication Security Laboratory Sichuan Chengdu610041 China

ISBN: (纸本)9783031306228

It is crucial and challenging to design a quantum-secure and efficient authentication key agreement scheme for IoT. The reasons are that not only there are various security requirements need to meet, but also communication party is resource-constrained. Recently, a large number of 2PAKA schemes for IoT have been presented, yet most of them are subject to quantum attack. In this paper, we put forward a quantum-secure 2PAKA protocol using lattice cryptography. The proposed LB-ID-2PAKA protocol makes use of identity-based signature to avoid the complicated certificate management of PKI-based protocol. At the same time, based on the ***, we apply Peikert’s reconciliation mechanism to save the communication cost. Our LB-ID-2PAKA protocol can be resistance against various attack and provide desired security property, especially support perfect forward secrecy. Moreover, the provable security analysis shows that our LB-ID-2PAKA protocol is provably secure under RO model and the hardness assumption of MLWE. © 2023, ICST Institute for Computer sciences, Social Informatics and Telecommunications Engineering.

关键词： Authentication

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High-speed implementation of privacy amplification for continuous-variable quantum-key distribution with Toeplitz matrix based on FPGA 10

High-speed implementation of privacy amplification for conti...

引用

Quantum and Nonlinear Optics X 2023

作者： Luo, Yujie Li, Yang Ma, Li Zhou, Chuang Yang, Jie Wu, Mei Zhang, Shuai Huang, Wei Xu, Bingjie Science and Technology on Communication Security Laboratory Institute of Southwestern Communication Chengdu610041 China

ISBN: (纸本)9781510667990

For a high-speed and secure continuous-variable quantum key distribution (CV-QKD) system, privacy amplification (PA) plays an important role. To reduce the finite size effect, the input length of PA should be at least on the order of 10^8, 10^9, 10^10 when the transmission distance is about 50km, 80km, 100km, respectively. This leads to high computation complexity and large storage demand of the data, which is unfriendly to field programmable gate array (FPGA) implementation for its limited resource. In addition, the limited IO speed of Double Data Rate Synchronous Dynamic Random Access Memory (DDR SDRAM) restricts the implementation performance of PA. In this paper, we propose an effective way to access data based on DDR to improve the performance of PA. As a result, the reading time from DDR can be reduced, and it can eliminate the effect of the limited IO speed of DDR, so that PA can perform with multiple code-words. This can make full use of the resource of FPGA and increase the execution speed of PA. Besides, combining with the proposed method, an easier algorithm is used to decrease the complexity of calculations. Based on these methods, we realize PA with Toeplitz matrix based on FPGA and the experimental throughput is about 288Mbps when the input length is about 100Mbits. © 2023 SPIE.

关键词： Quantum cryptography

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A high-throughput and FPGA-based LDPC decoder for continuous-variable quantum key distribution system 10

A high-throughput and FPGA-based LDPC decoder for continuous...

引用

Quantum and Nonlinear Optics X 2023

作者： Zhou, Chuang Li, Yang Ma, Li Luo, Yujie Yang, Jie Wu, Mei Zhang, Shuai Huang, Wei Xu, Bingjie Science and Technology on Communication Security Laboratory Institute of Southwestern Communication Chengdu610041 China

ISBN: (纸本)9781510667990

The throughput of error correction is one of the main bottlenecks of high-speed continuous variable quantum key distribution (CV-QKD) post-processing, which directly restricts the practical secret key rates (SKR). Implementing the decoder of low-density parity-check (LDPC) codes based on FPGA in limited precision can improve the decoding throughput significantly. In this paper, a high-throughput decoder architecture with limited precision for quasi-cyclic LDPC (QC-LDPC) codes is proposed. In particular, decoding of two typical LDPC codes, with code rates 0.2 and 0.1, for CV-QKD have been implemented on a commercial FPGA. The clock operates at 100 MHZ and the throughput of 1.44 Gbps and 0.78 Gbps is achieved, respectively, which can support 71.89 Mbps and 9.97 Mbps real-time SKR under transmission distance of 25 km and 50 km, respectively. The proposed architecture paves the way for high-rate real-time CV-QKD deployment in secure metropolitan area network. © 2023 SPIE.

关键词： Field programmable gate arrays (FPGA)

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An Orthogonal Dual-Polarization and Time Multiplexing Scheme of Continuous-Variable Quantum Key Distribution 21

An Orthogonal Dual-Polarization and Time Multiplexing Scheme...

引用

21st International Conference on Optical communications and Networks, ICOCN 2023

作者： Zhang, Shuai Pan, Yan Wang, Heng Shao, Yun Zhang, Tao Liu, Jinlu Pi, Yaodi Ye, Ting Huang, Wei Li, Yang Xu, Bingjie Institute of Southwestern Communication Science and Technology on Communication Security Laboratory Chengdu610041 China

ISBN: (纸本)9798350343502

In this article, we propose a time and orthogonal polarization division multiplexing scheme for local local oscillator continuous-variable quantum key distribution (LLO CV-QKD) system. According to the influence mechanism of time-domain diffusion and polarization disturbance on the key parameters, such as the channel transmittance and excess noise, of the studied system, we established a dual-polarization theoretical model and verified its validity by simulations. Here, the pulse width at the nanosecond level and polarization extinction ratio (PER) are considered for optimizing the performance of secure key rate (SIKR) quantitatively. For transmitting over 25 km optical fiber, the required PER should be above 22 dB when the pulse width is fixed to lns. Moreover, the optimal repetition frequency is obtained. In this case, 5.25 Mbps SKR can be achieved under the lns pulse width and 25dB PER, considering the 10 11 finite-size block. Our work provides a systematic and theoretical framework for the study of improving the SKR of the dual-polarization CV-QKD system. © 2023 IEEE.

关键词： Quantum cryptography

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Practical Phase Noise Model for Continuous Variable Quantum Key Distribution with a Real Local Oscillator 19

Practical Phase Noise Model for Continuous Variable Quantum ...

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19th International Conference on Optical communications and Networks, ICOCN 2021

作者： Shao, Yun Huang, Wei Li, Yang Wang, Heng Pan, Yan Pi, Yaodi Zhang, Chenlin Xu, Bingjie Science and Technology on Communication Security Laboratory Institute of Southwestern Communication Chengdu610041 China

ISBN: (纸本)9781665424462

In continuous-variable quantum key distribution with a local local oscillator (LLO CV-QKD), the phase noise after phase compensation is mainly composed of three parts: the relative phase drift noise, the relative phase accumulated noise, and the phase-reference measurement noise. Here, we develop a practical phase noise model for LLO CV-QKD protocols, in which part of the phase-reference measurement noise that can be locally calibrated by Bob at the receiver side is considered to be trusted noise. It is reasonable to adopt this model because Bob’s apparatus is inaccessible to the eavesdropper. We show that the secret key rate and the transmission distance of the LLO CV-QKD system under the practical phase noise model is significantly improved in comparison to that under the conventional phase noise model. We show that the secret key rate is improved more than 65% and the transmission distance is increased more than 70% with some typical simulation parameters. © 2021 IEEE.

关键词： Quantum cryptography

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