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Ppdcp-Abe: Privacy-Preserving Decentralized Ciphertext-Policy Attribute-Based Encryption, Jinguang Han, Willy Susilo, Yi Mu, Jianying Zhou, Man Ho Au
Ppdcp-Abe: Privacy-Preserving Decentralized Ciphertext-Policy Attribute-Based Encryption, Jinguang Han, Willy Susilo, Yi Mu, Jianying Zhou, Man Ho Au
Faculty of Engineering and Information Sciences - Papers: Part A
Cipher-policy attribute-based encryption (CP-ABE) is a more efficient and flexible encryption system as the encryptor can control the access structure when encrypting a message. In this paper, we propose a privacy-preserving decentralized CP-ABE (PPDCP-ABE) scheme where the central authority is not required, namely each authority can work independently without the cooperation to initialize the system. Meanwhile, a user can obtain secret keys from multiple authorities without releasing his global identifier (GID) and attributes to them. This is contrasted to the previous privacy-preserving multi-authority ABE (PPMA-ABE) schemes where a user can obtain secret keys from multiple authorities with them knowing his …
Improving Privacy And Security In Decentralized Ciphertext-Policy Attribute-Based Encryption, Jinguang Han, Willy Susilo, Yi Mu, Jianying Zhou, Man Ho Au
Improving Privacy And Security In Decentralized Ciphertext-Policy Attribute-Based Encryption, Jinguang Han, Willy Susilo, Yi Mu, Jianying Zhou, Man Ho Au
Faculty of Engineering and Information Sciences - Papers: Part A
In previous privacy-preserving multi-authority attribute-based encryption (PPMA-ABE) schemes, a user can acquire secret keys from multiple authorities with them knowing his/her attributes and furthermore, a central authority is required. Notably, a user’s identity information can be extracted from his/her some sensitive attributes. Hence, existing PPMAABE schemes cannot fully protect users’ privacy as multiple authorities can collaborate to identify a user by collecting and analyzing his attributes. Moreover, ciphertext-policy ABE (CPABE) is a more efficient public-key encryption where the encryptor can select flexible access structures to encrypt messages. Therefore, a challenging and important work is to construct a PPMA-ABE scheme where …
Enhanced Privacy Of A Remote Data Integrity-Checking Protocol For Secure Cloud Storage, Yong Yu, Man Ho Au, Yi Mu, S Tang, J Ren, Willy Susilo, Liju Dong
Enhanced Privacy Of A Remote Data Integrity-Checking Protocol For Secure Cloud Storage, Yong Yu, Man Ho Au, Yi Mu, S Tang, J Ren, Willy Susilo, Liju Dong
Faculty of Engineering and Information Sciences - Papers: Part A
Remote data integrity checking (RDIC) enables a server to prove to an auditor the integrity of a stored file. It is a useful technology for remote storage such as cloud storage. The auditor could be a party other than the data owner; hence, an RDIC proof is based usually on publicly available information. To capture the need of data privacy against an untrusted auditor, Hao et al. formally defined "privacy against third party verifiers" as one of the security requirements and proposed a protocol satisfying this definition. However, we observe that all existing protocols with public verifiability supporting data update, …
P2ofe: Privacy-Preserving Optimistic Fair Exchange Of Digital Signatures, Qiong Huang, Duncan S. Wong, Willy Susilo
P2ofe: Privacy-Preserving Optimistic Fair Exchange Of Digital Signatures, Qiong Huang, Duncan S. Wong, Willy Susilo
Faculty of Engineering and Information Sciences - Papers: Part A
How to sign an electronic contract online between two parties (say Alice and Bob) in a fair manner is an interesting problem, and has been studied for a long time. Optimistic Fair Exchange (OFE) is an efficient solution to this problem, in which a semi-trusted third party named arbitrator is called in to resolve a dispute if there is one during an exchange between Alice and Bob. Recently, several extensions of OFE, such as Ambiguous OFE (AOFE) and Perfect AOFE (PAOFE), have been proposed to protect the privacy of the exchanging parties. These variants prevent any outsider including the arbitrator …
New Insight To Preserve Online Survey Accuracy And Privacy In Big Data Era, Joseph K. Liu, Man Ho Au, Xinyi Huang, Willy Susilo, Jianying Zhou, Yong Yu
New Insight To Preserve Online Survey Accuracy And Privacy In Big Data Era, Joseph K. Liu, Man Ho Au, Xinyi Huang, Willy Susilo, Jianying Zhou, Yong Yu
Faculty of Engineering and Information Sciences - Papers: Part A
An online survey system provides a convenient way for people to conduct surveys. It removes the necessity of human resources to hold paper surveys or telephone interviews and hence reduces the cost significantly. Nevertheless, accuracy and privacy remain as the major obstacles that need additional attention. To conduct an accurate survey, privacy maybe lost, and vice versa. In this paper, we provide new insight to preserve these two seeming contradictory issues in online survey systems especially suitable in big data era. We propose a secure system, which is shown to be efficient and practical by simulation data. Our analysis further …
A New Payment System For Enhancing Location Privacy Of Electric Vehicles, Man Ho Au, Joseph K. Liu, Junbin Fang, Zoe L. Jiang, Willy Susilo, Jianying Zhou
A New Payment System For Enhancing Location Privacy Of Electric Vehicles, Man Ho Au, Joseph K. Liu, Junbin Fang, Zoe L. Jiang, Willy Susilo, Jianying Zhou
Faculty of Engineering and Information Sciences - Papers: Part A
An electric vehicle (EV) is a promising and futuristic automobile propelled by electric motors, using electrical energy stored in batteries or another energy storage device. Due to the need for the battery to be recharged, the cars will be required to visit a recharging infrastructure very frequently. This may disclose the users' private information, such as their location and, thus, compromise users' privacy. In this paper, we propose a new payment system that is suitable for EVs. Our system not only supports privacy protection (location privacy) but supports traceability in the case where the cars are stolen as well. Our …