Abstract 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.
Fund: Project supported by the National
Natural Science Foundation of China (Grant No.~60971104), the Basic
Research Foundation of Sichuan Province, China (Grant
No.~2006J013-011), and the Outstanding Young Researchers Foundation
of Sichuan Province, China (Gra
Cite this article:
Li Heng-Jian(李恒建) and Zhang Jia-Shu(张家树) A novel chaotic stream cipher and its application to palmprint template protection 2010 Chin. Phys. B 19 040505
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