EDP Sciences

Zhou và cộng sự đã chỉ ra một cuộc tấn công vào giao thức thoả thuận đa khóa xác thực đã được chỉnh sửa của Harn, đồng thời đưa ra một giao thức có thể ngăn chặn cuộc tấn công chia sẻ khóa không xác định. Bài báo chỉ ra rằng giao thức này dễ bị tổn thương trước cuộc tấn công nối chuỗi. Bài báo này đề xuất một giao thức thoả thuận đa khóa xác thực cải tiến, cho thấy cách làm cho giao thức của Harn an toàn hơn bằng cách sửa đổi chữ ký và xác minh. Và giao thức này có thể thoát khỏi cuộc tấn công nối chuỗi.

Signcryption is a cryptographic primitive that performs signature and encryption simultaneously, at lower computational costs and communication overheads than the signature-then-encryption approach. In this paper, we propose an efficient multi-recipient signcryption scheme based on the bilinear pairings, which broadcasts a message to multiple users in a secure and authenticated manner. We prove its semantic security and unforgeability under the Gap Diffie-Hellman problem assumption in the random oracle model. The proposed scheme is more efficient than re-signcrypting a message n times using a signcryption scheme in terms of computational costs and communication overheads.

Key management is a fundamental security service in wireless sensor networks. The communication security problems for these networks are exacerbated by the limited power and energy of the sensor devices. In this paper, we describe the design and implementation of an efficient key management scheme based on low energy adaptive clustering hierarchy (LEACH) for wireless sensor networks. The design of the protocol is motivated by the observation that many sensor nodes in the network play different roles. The paper presents different keys are set to the sensors for meeting different transmitting messages and variable security requirements. Simulation results show that our key management protocol based-on LEACH can achieve better performance. The energy consumption overhead introduced is remarkably low compared with the original Kerberos schemes.

Type 2 diabetes (T2D) is now considered a pandemic noncommunicable disease, and the prevalence is still increasing steadily worldwide. Several lines of evidence, including T2D, is an aging-related disease, and the phenomenon of the metabolic memory and developmental origins of adult diabetes argues that epigenetic disorder plays critical roles in the development of T2D. Environmental factors can affect epigenetics during early fetal life until adulthood. Altered epigenetics can be maintained during mitosis and meiosis, so that the subsequent response to environmental cue in later life has also been altered. Epigenetic aberrations affect miRNA expression and functions, and altered miRNA expression can also affect expression of many genes including those relevant to epigenetics. Thus, the development of T2D is an accumulative process that may involve complex interactions between altered transcription factors, miRNA functions, and increased epigenetics disorder in response to environmental stimuli during different stages of life.

The linear and nonlinear charecteristics of verious optical fiber loop resonators have been processed uniformly using transmission matrix method. It is pointed that in nonlinear operation condition each of those optical fiber loop resonators may be used to make an all-optical fiber bistability device. The configuration, charecterictics and threshold of verious Er-doped fiber loop bistability devices have been calculated, analysised and compared, and the design principle of those devices has been given.

We improve the iterative decoding algorithm by utilizing the “leaked” residual redundancy at the output of the source encoder without changing the encoder structure for the noisy channel. The experimental results show that using the residual redundancy of the compressed source in channel decoding is an effective method to improve the error correction performance.