With the increasing publicity of information, more and more users are willing to share their data with others. Therefore, in cloud storage services, the security of shared data has begun to attract attention. Most of the current integrity auditing schemes cannot balance data sharing and audit security well. In view of this, we propose an audit scheme based on blockchain and file prediction in the shared environment. On the one hand, a lightweight signature algorithm is designed to realize the revocation of group members without source data transmission, which greatly avoids the communication overhead between the user and the cloud. On the other hand, we introduce blockchain technology into auditing and use smart contracts to verify the integrity of cloud data, making the system more secure, tamper-resistant, and traceable. Finally, in order to ensure that a file is audited only when necessary, we propose the concept of valid auditing and predict the frequently accessed or likely accessed files in the sharing group, which greatly improves the valid auditing rate and saves system computing resources. The security analysis proves that our method is safe and reliable. The performance evaluation and experimental comparison prove that our scheme has high efficiency. 

Blockchain-based integrity auditing for shared data in cloud storage with file prediction

Deep Reinforcement Learning-based computation offloading and distributed edge service caching for Mobile Edge Computing

Improved Sunflower Optimization Algorithm Based Encryption with Public Auditing Scheme in Secure Cloud Computing

Secure and efficient public auditing system of user data using hybrid AES-ECC crypto system with Merkle hash tree in blockchain

Electric Vehicle (EV) has become one of the promising solutions to the ever-evolving environmental and energy crisis. The key to the wide adoption of EVs is a pervasive charging infrastructure, composed of both private/home chargers and public/commercial charging stations. The security of EV charging, however, has not been thoroughly investigated. This paper investigates the communication mechanisms between the chargers and EVs, and exposes the lack of protection on the authenticity in the SAE J1772 charging control protocol. To showcase our discoveries, we propose a new class of attacks, ChargeX, which aims to manipulate the charging states or charging rates of EV chargers with the goal of disrupting the charging schedules, causing a denial of service (DoS), or degrading the battery performance. ChargeX inserts a hardware attack circuit to strategically modify the charging control signals. We design and implement multiple attack systems, and evaluate the attacks on a public charging station and two home chargers using a simulated vehicle load in the lab environment. Extensive experiments on different types of chargers demonstrate the effectiveness and generalization of ChargeX. Specifically, we demonstrate that ChargeX can force the switching of an EV's charging state from ``stand by"to ``charging", even when the vehicle is not in the charging state. We further validate the attacks on a Tesla Model 3 vehicle to demonstrate the disruptive impacts of ChargeX. If deployed, ChargeX may significantly demolish people's trust in the EV charging infrastructure.

ChargeX: Exploring State Switching Attack on Electric Vehicle Charging Systems

A novel blockchain-based and proxy-oriented public audit scheme for low performance terminal devices

—Tesla Model 3 has equipped with Phone Keys and Key Cards in addition to traditional key fobs for better driving experiences. These new features allow a driver to enter and start the vehicle without using a mechanical key through a wireless authentication process between the vehicle and the key. Unlike the requirements of swiping against the car for Key Cards, the Tesla mobile app’s Phone Key feature can unlock a Model 3 while your smartphone is still in a pocket or bag. In this paper, we performed a detailed security analysis aiming at Tesla keys, especially for Key Cards and Phone Keys. Starting with reverse engineering the mobile application and sniffing the communication data, we reestablished pairing and authentication protocols and analyzed their potential issues. Missing the certificate verification allows an unofficial Key Card to work as an official one. Using these third-party products may lead to serious security problems. Also, the weaknesses of the current protocol lead to a man-in-the-middle (MitM) attack through a Bluetooth channel. The MitM attack is an improved relay attack breaking the security of the authentication procedures for Phone Keys. We also developed an App named TESmLA installed on customized Android devices to complete the proof-of-concept. The attackers can break into Tesla Model 3 and drive it away without the awareness of the car owner. Our results bring into question the security of Passive Keyless Entry and Start (PKES) and Bluetooth implementations in security-critical applications. To mitigate the security problems, we discussed the corresponding countermeasures and feasible secure scheme in the future.

Access Your Tesla without Your Awareness: Compromising Keyless Entry System of Model 3

This paper presents a lightweight countermeasure scheme of SM4 cryptographic algorithm against side channel analysis attacks. SM4 is one of the widely used block ciphers in information computing and data communication. However, as it is usually implemented in cryptographic devices, it is definitely under the threat of side channel analysis attacks. Some schemes of implementations have been provided as the countermeasures against the side channel analysis attacks, which leads to a relatively complicated realization on both cost and performance. This paper proposes a new mask scheme for SM4 implementation with lightweight cost and low performance loss. Experiment results show the effectiveness of the method against the side channel analysis attacks.

A Lightweight Countermeasure of SM4 against Side Channel Analysis

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Papers

A novel blockchain-based and proxy-oriented public audit scheme for low performance terminal devices

Access Your Tesla without Your Awareness: Compromising Keyless Entry System of Model 3

A Lightweight Countermeasure of SM4 against Side Channel Analysis