6D-Chaotic System and 2D Fractional Discrete Cosine Transform Based Encryption of Biometric Templates

A new algorithm for biometric templates using a 6D-chaotic system, and 2D fractional discrete cosine transform (FrDCT) is proposed in this paper. In technique, the $k$ are represented into three groups. After representation, these groups converted row vectors scrambled by keys generated system after that, combined matrices. The matrices then mixed horizontally divided two halves, with left half serving as real part right imaginary of complex-valued matrix (CVM). This CVM further subjected to FrDCT. output FrDCT separated parts. robustness technique enhanced substitution operation system. Thus, final encrypted template obtained. analysis like security, statistical, attacks given authenticate reliability technique. experimental values also show that resistant brute force attacks.