Imperceptible Improvement of Secure Image Steganography based on Wavelet Transform and OTP Encryption using PN Generator

Abstract

Digital data is widely transacted through internet media that can be accessed publicly, so this requires security of the data. This research proposes a combination of steganography and cryptography methods using wavelet transforms and OTP encryption based on PN generators. The PN generator is used as a tool to generate binary random numbers that are used to improve the quality of the embedding process and the encryption process. Messaging is carried out with four levels of wavelet transformation, the first three levels of the LL subband are selected to be transformed, while the fourth level wavelet transformation is selected for the HH subband to be embedded. This subband selection strategy is carried out with the aim of getting good imperceptibility and robust values. While OTP encryption is proposed because it has strong encryption results with a lightweight computing process. Based on the experimental results, binary random numbers generated by PN generators have been proven to successfully improve the quality of stego images and security. This has been measured by the PSNR and MSE, where there are remembrances on the two measuring instruments.