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In order to achieve secure access to fingerprint image, a symmetric fingerprint image encryption is proposed in this paper. The proposed algorithm is based on combination of scrambling and confusion processes. Chaotic map is used for the scrambling the addresses of the fingerprint image pixels while bit-level permutation is used to confuse the values of image pixels so as to enhance the security. Experimental results are carried out with detailed analysis to demonstrate that the proposed image encryption scheme possesses large key space to resist brute-force attack and possesses good statistical properties to frustrate statistical analysis attacks. Experiments are also performed to illustrate the robustness against malicious attacks like cropping, noising.