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| 1 | Fuzzy conditional proxy re-encryption显示文摘Weng et al.introduced the notion of conditional proxy re-encryption(C-PRE),whereby only the ciphertext satisfying one condition set by Alice can be re-encrypted by the proxy.To achieve more fine-grained delegation on the condition set,we introduce a new cryptographic primitive called fuzzy conditional proxy re-encryption(FC-PRE) in which we view conditions in C-PRE as a set of descriptive keywords.A FC-PRE scheme allows for a proxy with the re-encryption key for a conditional keyword set,W,to re-encrypt a ciphertext encrypted with a conditional keyword set,W,if and only if W and W are close to each other as measured by the 'set overlap' distance metric.Therefore,our system allows a certain amount of error-tolerance in the conditions.We formalize the FC-PRE security model by incorporating the advantages in previous C-PRE.Finally,we present an efficient construction of FC-PRE scheme,and prove its CCA-security under the wellstudied decisional bilinear Diffie-Hellman(DBDH) assumption in the random oracle model. | FANG LiMing WANG JianDong GE ChunPeng REN YongJun | 2013 | Science China(Information Sciences)2013，56，5： | 2 |
| 2 | Interac- tive conditional proxy re-eneryption with fine grain policy 显示文摘 | Liming Fang Willy Susilo Chunpeng Ge | 2011 | Journal of Systems and Software2011，84，12： | 1 |
| 3 | A privacy preserving two-factor authentication protocol for the Bitcoin SPV nodes显示文摘In the Bitcoin network, the simplified payment verification protocol(SPV) enables a lightweight device such as a mobile phone to participate in the bitcoin network without needed to download and store the whole Bitcoin blocks. A Bitcoin SPV node initiates and verifies transactions of the Bitcoin network through the Bitcoin wallet software which is deployed on a resource constrained device such as a mobile phone. Thus, the security of the wallet is critical for the SPV nodes as it may affect the security of user’s cryptocurrencies. However, there are some concerns about the security flaws within the SPV nodes which could lead to significant economic losses. Most of these vulnerabilities can be resolved by employing a secure user authentication protocol. Over the years, researchers have engaged in designing a secure authentication protocol. However, most proposals have security flaws or performance issues. Recently, Park et al. proposed a two-party authenticated key exchange protocol for the mobile environment. They claimed that their protocol is not only secure against various attacks but also can be deployed efficiently. However, after a thorough security analysis, we find that the Park et al.’s protocol is vulnerable to user forgery attack, smart card stolen attack and unable to provide user anonymity. To enhance security, we proposed an efficient and secure user authentication protocol for the SPV nodes in the mobile environment which can fulfill all the security requirements and has provable security. Additionally, we provide performance analysis which shows our proposed protocol is efficient for the SPV nodes in the Bitcoin network. | Lu ZHOU Chunpeng GE Chunhua SU | 2020 | Science China(Information Sciences)2020，63，3： | 1 |
| 4 | Key-Private Identity-Based Proxy Re-Encryption显示文摘An identity-based proxy re-encryption scheme(IB-PRE)allows a semi-trusted proxy to convert an encryption under one identity to another without revealing the underlying message.Due to the fact that the proxy was semi-trusted,it should place as little trust as necessary to allow it to perform the translations.In some applications such as distributed file system,it demands the adversary cannot identify the sender and recipient’s identities.However,none of the exiting IB-PRE schemes satisfy this requirement.In this work,we first define the security model of key-private IB-PRE.Finally,we propose the first key-private IB-PRE scheme.Our scheme is chosen plaintext secure(CPA)and collusion resistant in the standard model. | Chunpeng Ge Jinyue Xia Liming Fang | 2020 | Computers, Materials & Continua2020，，5： | 1 |
| 5 | Ciphertext-policy attribute-based proxy re-encryption via constrained PRFs显示文摘Dear editor,To maintain the confidentiality of the sensitive data,users tend to encrypt their data under an associated access policy(or attributes)before outsourcing them to the cloud.In the traditional access control model via cryptographic approaches,e.g.,ciphertext-policy attribute-based encryption(or CP-ABE),users are allowed to formulate access policies and let the encrypted data associated with access policies.Only authenticated users,whose own attributes matching their formulated access policies,have the privilege to recover the ciphertext.However,once the access policies are formulated,the authorized user cannot update it unless the user downloads and re-encrypts the file under the new access policy.Hence,to achieve dynamic access control,the model of ciphertext-policy attribute-based proxy re-encryption(or CP-AB-PRE)is adopted by integrating the proxy re-encryption(or PRE). | Zengpeng LI Vishal SHARMA Chunguang MA Chunpeng GE Willy SUSILO | 2021 | Science China(Information Sciences)2021，64，6： | 0 |
| 6 | Cryptanalysis of Key Exchange Protocol Based on Tensor Ergodic Problem显示文摘Recently, Mao, Zhang, Wu et al. constructed two key exchange(KE) protocols based on tensor ergodic problem(TEP). Although they conjectured that these constructions can potentially resist quantum computing attack, they did not provide a rigorous security proof for their KE protocols. In this paper, applying the properties of ergodic matrix, we first present a polynomial time algorithm to solve the TEP problem using O(n^6) arithmetic operations in the finite field, where n is the security parameter. Then, applying this polynomial time algorithm, we generate a common shared key for two TEP-based KE constructions, respectively. In addition, we also provide a polynomial time algorithm with O(n^6) arithmetic operations that directly recovers the plaintext from a ciphertext for the KE-based encryption scheme. Thus, the TEP-based KE protocols and their corresponding encryption schemes are insecure. | Chunsheng Gu Youyu Gu Peizhong Shi Chunpeng Ge Zhenjun Jing | 2018 | China Communications2018，15，10： | 0 |
| 7 | Design of Intelligent Drunk Driving Detection System Based on Internet of Things显示文摘In recent years,with the rapid development of China’s economy and the continuous improvement of people’s living standards,the number of motor vehicles and the number of drivers in the country have grown rapidly.Due to the increase in the number of vehicles and the number of motorists,the traffic accident rate is increasing,causing serious economic losses to society.According to the traffic accident statistics of the Ministry of Communications of China in 2009,more than 300,000 car accidents occurred in the year,most of which were caused by drunk driving.Therefore,this paper proposes a design scheme based on the Internet of Things-based vehicle alcohol detection system.The system uses STM8S003F3 single-chip microcomputer as the main control chip of the system,combined with alcohol sensor MQ-3 circuit,LCD1602 liquid crystal display circuit,buzzer alarm circuit and button circuit to form a complete alcohol detection module hardware system.The main functions of the system are as follows:the alcohol sensor in the car detects the driver’s alcohol concentration value,and displays the value on the LCD screen.The buzzer alarm is exceeded and the information is sent to the traffic police department and the family’s mobile phone through the GPRS module.The system can effectively make up for the shortcomings of traffic police detection,which has certain research significance. | Xiaorong Zhao Hongjin Zhu Xiufang Qian Chunpeng Ge | 2019 | Journal on Internet of Things2019，1，2： | 0 |
| 8 | A High Gain, Noise Cancelling 2515-4900 MHz CMOS LNA for China Mobile 5G Communication Application显示文摘With the development of the times,people’s requirements for communication technology are becoming higher and higher.4G communication technology has been unable to meet development needs,and 5G communication technology has emerged as the times require.This article proposes the design of a low-noise amplifier(LNA)that will be used in the 5G band of China Mobile Communications.A low noise amplifier for mobile 5G communication is designed based on Taiwan Semiconductor Manufacturing Company(TSMC)0.13μm Radio Frequency(RF)Complementary Metal Oxide Semiconductor(CMOS)process.The LNA employs self-cascode devices in current-reuse configuration to enable lower supply voltage operation without compromising the gain.This design uses an active feedback amplifier to achieve input impedance matching,avoiding the introduction of resistive negative feedback to reduce gain.A common source(CS)amplifier is used as the input of the low noise amplifier.In order to achieve the low power consumption of LNA,current reuse technology is used to reduce power consumption.Noise cancellation techniques are used to eliminate noise.The simulation results in a maximum power gain of 22.783,the reverse isolation(S12)less than-48.092 dB,noise figure(NF)less than 1.878 dB,minimum noise figure(NFmin)=1.203 dB,input return loss(S11)and output return loss(S22)are both less than-14.933 dB in the frequency range of 2515-4900 MHz.The proposed Ultra-wideband(UWB)LNA consumed 1.424 mW without buffer from a 1.2 V power supply. | Xiaorong Zhao Weili Cheng Hongjin Zhu Chunpeng Ge Gengyuan Zhou Zhongjun Fu | 2020 | Computers, Materials & Continua2020，，8： | 0 |
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