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With advancement of computer community and widespread dissemination of network applications, users generally need multiple servers to provide different services. Accordingly, the multiserver architecture has been prevalent, and designing a secure and efficient remote user authentication under multiserver architecture becomes a nontrivial challenge. In last(More)
In this paper, we present a certificateless signature (CLS) scheme that is proved to be secure in the random oracle model under the hardness assumptions of k-CAA and Inv-CDHP. Our scheme upholds all desirable properties of previous CLS schemes, and requires general cryptographic hash functions instead of the MapToPoint hash function which is inefficient and(More)
To study the communication between information systems, Wang et al. Communicating between information systems, Information Sciences 178 (2008) 3228-3239] proposed two concepts of type-1 and type-2 consistent functions. Some properties of such functions and induced relation mappings have been investigated there. In this paper, we provide an improvement of(More)
Keywords: Steganography Four-pixel differencing Modified LSB substitution Data hiding Pixel-value differencing Error block Embedding capacity Imperceptible a b s t r a c t To improve the embedding capacity and provide an imperceptible visual quality, a novel steganographic method based on four-pixel differencing and modified least significant bit (LSB)(More)
Recently, Wang et al. discussed the properties of fuzzy information systems under homomorphisms in the paper [C.], where homomorphisms are based upon the concepts of consistent functions and fuzzy relation mappings. In this paper, we classify consistent functions as predecessor-consistent and successor-consistent, and then proceed to present more properties(More)
The notions of entropy and co-entropy associated to partitions have been generalized to coverings when Pawlak's rough set theory based on partitions has been extended to covering rough sets. Unfortunately, the monotonicities of entropy and co-entropy with respect to the standard partial order on partitions do not behave well in this generalization. Taking(More)