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As a protection and authentication technology, digital watermarking technology has been used in the medical image field. In this paper, a digital watermarking algorithm is proposed based on integer wavelet transform to protect digital medical images and estimate its integrity and authenticity. Using matrix norm quantization, watermarks are embedded into low-frequency, medium-frequency and high-frequency...
Electronic coupons have been accepted as a useful means in e-commerce. Multi-coupons are a special type of coupons, which are more efficient than single coupons in practice. So far, the application of multi-coupon systems is plagued by two main issues, i.e. how to provide efficient and flexible mechanism for redeeming, and how to implement the issuing protocol efficiently. In this paper, we give a...
With the popularity and development of distributed systems, the problem of integration of multiple access control mechanisms of information systems emerged inevitably. Theories on graph and state machine are used to research the mapping from local security mechanism to the global access control mechanism. An integration model: authorization propagation tree (APT) model which support DAC, MAC and RBAC...
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