Sensor networks are expected to be used at anywhere in the near future and recently their security problems have been rising. Due to the limited computing power of senor nodes, it is impossible to use asymmetric cryptography approaches for the session key establishment or to apply advanced encryption method such as AES and DES for the data encryption. In this paper, therefore, we propose a key establishment and a data encryption scheme for secure and energy-efficient data transmission in wireless sensor networks (WSNs). The proposed schemes just treat simple operations as a message authentication code (MAC), exclusive-OR (XOR) and time-spacing key derivation function (TSDF). Additionally, the security of the proposed protocols is analyzed.
This paper proposes a new efficient and secure copyright protection scheme for digital watermarking by using visual cryptography technique. The proposed scheme has the following merits compare with previous related schemes: (1) The proposed scheme uses simple codebook to generate a watermarked image. (2) The proposed scheme does not need to expand the watermark image. (3) The proposed scheme eliminates two security problems on the previous Lou et al.'s scheme which that the problem of stability of relationship between discrete wavelet transform (DWT) coefficients and the problem of ambiguity of watermark verification. As a result, the proposed scheme is more efficient and secure compare with previous related schemes.
In 2013, Tsai et al. proposed a reversible data hiding scheme based on neighboring pixel differences. Although their scheme has better quality than histogram shifting based typical schemes, the hiding capacity is smaller than other schemes. In this paper, an improved Tsai et al.'s scheme is proposed by using three neighboring pixel differences and an absolute value of a difference. In our experimental results, the hiding capacity and image quality of the proposed scheme is superior to their scheme.
Recently, secure group-oriented applications have grown very rapidly. In order to provide secure group communication, WMNs (Wireless Mesh Network) are required to establish a secret key which is shared with all participants. Recently, Tseng proposed an authenticated group key agreement for regarding mobile networks. This mobile network is an asymmetric wireless network which includes many lowpower nodes and several powerful nodes. However, this protocol does not satisfy some important security properties such as implicit key authentication. In this paper, we conducted an analysis of Tseng's protocol and propose a secure and efficient group key agreement protocol regarding WMNs which improved upon it. The proposed protocol not only reduces the computational cost, but also meets strong security requirements.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.