Decentralized Inner-Product Encryption with Constant-Size Ciphertext

Abstract

With the rise of technology in recent years, more people are studying distributed system architecture, such as the e-government system. The advantage of this architecture is that when a single point of failure occurs, it does not cause the system to be invaded by other attackers, making the entire system more secure. On the other hand, inner product encryption (IPE) provides fine-grained access control, and can be used as a fundamental tool to construct other cryptographic primitives. Lots of studies for IPE have been proposed recently. The first and only existing decentralized IPE was proposed by Michalevsky and Joye in 2018. However, some restrictions in their scheme may make it impractical. First, the ciphertext size is linear to the length of the corresponding attribute vector; second, the number of authorities should be the same as the length of predicate vector. To cope with the aforementioned issues, we design the first decentralized IPE with constant-size ciphertext. The security of our scheme is proven under the ℓ-DBDHE assumption in the random oracle model. Compared with Michalevsky and Joye’s work, ours achieves better efficiency in ciphertext length and encryption/decryption cost.

Particle Filter Design for Robust Nonlinear Control System of Uncertain Heat Exchange Process with Sensor Noise and Communication Time Delay

“…It can be seen from Table 2 that after incorporating the generic particle filter algorithm into the control system, the variance of the sensor noise is reduced when the variance of sensor noise imposed is σ 2 s < 1.5 2 . However, as the sensor noise increases to σ 2 s ≥ 1.5 2 (about 15 2 times the modeled noise), the particle filter with weight adjustment algorithm is necessary and the incorporation of that is effective in reducing the effects of large sensor noise.…”

“…Current control systems integrating communication, calculation, and control into different levels of factory operations and information processing have become the trend of modern military, commercial, and industrial systems [1,2], one of which is the robust nonlinear uncertain heat exchange control system. In such systems, sensors are employed to increase the accuracy of processing options.…”

Advances in Information Security and Privacy

“…In this Special Issue, four papers discuss this topic. Tseng Yi-Fan and Shih-Jie Gao [3] define a new form of inner product encryption to provide fine-grained access control to secure distributed system architectures. The main advantages of this scheme are that it is the first decentralized scheme with constant-size ciphertext and it reduces encryption/decryption costs compared to the state of the art.…”