Z transformation-based high payload authentication technique with higher region of convergence value (ZATHRoc)

Abstract

In this paper, a Z transformation-based authentication technique has been proposed with higher Region of Convergence (ROC) value. Sequentially, five bits from the authenticating mask in row major order are considered and embedded into composite real as well as imaginary components of second, third, and fourth transform domain coefficients keeping the low frequency component unaltered which is further utilized for adjustment. The proposed method provides a good secure scheme in terms of robustness and sensitivity of higher ROC of Z transform domain and also in terms of the inclusion of random chaotic map. Comparisons have been made with existing methods such as AINCDCT (2011), Luo’s Method (2011), SCDFT (2008), and AHRocZ (2015) which exhibit a better performance with proper visual quality.