Zongmin Cui

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Digital transmission of medical images often involves hiding crucial information in some parts of the images which should be later extracted to authenticate ownership and identity. In this paper, a new reversible data hiding (RDH) algorithm for medical images is proposed. The primary objective of the algorithm is to achieve contrast enhancement of the(More)
IOT (internet of things) owner may not want their sensitive data to be public in the cloud. However, the client operated by IOT owner may be too lightweight to provide the encryption/decryption service. To remove the issue, we propose a novel solution to minimize the access control cost for IOT owner. First, we present a security model for IOT with minimal(More)
While outsourcing data to cloud, security and efficiency issues should be taken into account. However, it is very challenging to design a secure and efficient mechanism supporting authorization updates. In this paper, we aim to provide a mechanism supporting authorization updates which only incurs a lightweight cost of authorization updates and meanwhile(More)
A traditional classification approach based on keyword matching represents each text document as a set of keywords, without considering the semantic information, thereby, reducing the accuracy of classification. To solve this problem, a new classification approach based on Wikipedia matching was proposed, which represents each document as a concept vector(More)
In this paper, a reversible authentication scheme based on prediction-error expansion (PEE) is proposed. Firstly, the compound symbolic chaos sequence as well as image block pixel bits and position-bits are input into a hash function to produce hash-bits. Then exclusive-or operation, between the label-bits taken from the chaos sequence and hash-bits, is(More)
It is well-known that erasure codes, such as Reed-Solomn (RS) and Cauchy Reed-Solumn Codes (CRS), have played an important roles in distributed storage system to both industry and academic. While RS and CRS codes provide significant savings in storage space, they will decrease systems performance while encoding and decoding. In this paper we have developed(More)