A novel chaotic stream cipher and its application to palmprint template protection  

作　　者：李恒建 张家树 

机构地区：[1]Sichuan Province Key Lab of Signal & Information Processing,Southwest Jiaotong University

出　　处：《Chinese Physics B》2010年第4期102-111,共10页中国物理B（英文版）

基　　金：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);the Outstanding Young Researchers Foundation of Sichuan Province,China (Grant No. 09ZQ026-091);the Research Fund for the Doctoral Program of Higher Education of China(Grant No. 20090184110008)

摘　　要：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.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.

关 键 词：chaotic stream cipher coupled nonlinear dynamic filter biometric protection cancelable competitive code 

分 类 号：O415.5[理学—理论物理] TN918.1[理学—物理]