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Based on a coupled nonlinear dynamic filter (NDF), a novel
chaotic stream cipher is presented in this paper and employed to
protect palmprint templates. The chaotic pseudorandom bit generator
(PRBG) based on a coupled NDF, which is constructed in an inverse
flow, can generate multiple bits at one iteration and satisfy the
security requirement of cipher design. Then, the stream cipher is
employed to generate cancelable competitive code palmprint
biometrics for template protection. The proposed cancelable
palmprint authentication system depends on two factors: the
palmprint biometric and the password/token. Therefore, the system
provides high-confidence and also protects the user's privacy. The
experimental results of verification on the Hong Kong PolyU Palmprint
Database show that the proposed approach has a large template
re-issuance ability and the equal error rate can achieve 0.02%.
The performance of the palmprint template protection scheme proves the
good practicability and security of the proposed stream cipher. 相似文献
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In this study an adaptive arithmetic coder is embedded in the Baptista-type chaotic cryptosystem for implementing secure data compression. To build the multiple lookup tables of secure data compression, the phase space of chaos map with a uniform distribution in the search mode is divided non-uniformly according to the dynamic probability estimation of plaintext symbols. As a result, more probable symbols are selected according to the local statistical characters of plaintext and the required number of iterations is small since the more probable symbols have a higher chance to be visited by the chaotic search trajectory. By exploiting non-uniformity in the probabilities under which a number of iteration to be coded takes on its possible values, the compression capability is achieved by adaptive arithmetic code. Therefore, the system offers both compression and security. Compared with original arithmetic coding, simulation results on Calgary Corpus files show that the proposed scheme suffers from a reduction in compression performance less than 12{\%} and is not susceptible to previously carried out attacks on arithmetic coding algorithms. 相似文献
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