Bl-IEA: A Bit-Level Image Encryption Algorithm using Transformation and Chaotic Skew Tent Map based Substitution for Fingerprint Images
Aditya G Kulkarni, S. N. Prajwalasimha, Naveen Kulkarni, Deepthika Karuppusamy, Raveena Dharmappa, Yash Bagga · 2024
In order to fortify pre-stored biometric data of fingerprint samples in the biometric authentication system, a hybrid approach based on Pseudo Hadamard transformation and Skew Tent chaotic substitution is proposed. Inter pixel redundancy and strong correlation between the adjacent pixels in an image is condensed by imperiling it to transformation and chaotic substitution. Pixel value variation is accomplished using modified Pseudo Hadamard chaotic transformation and pixel position variation is made by substitution using S-boxes. Secrete key is used for encryption with 256 bits. S-box is constructed using chaotic Skew Tent map to generate random numbers. Fingerprint images are considered from FVC2004. Encrypted/Decrypted images are considered for experimental analysis. Two stage fortifications are provided using transformation and substitution. The results obtained for standard images are compared to existing techniques and high degree of security is achieved by this proposed technique.