An improved secure image hiding technique using PN-sequence based on DCT-OTP
Muhammad Najih Muhammad Najih, De Rosal Ignatius Moses Setiadi, Eko Hari Rachmawanto, Christy Atika Sari, Setia Astuti · 2017
The security of sending confidential data on the internet is very important. Thus, the data security techniques must be developed. Techniques like cryptography and steganography are techniques that are widely used to protect information messages that are confidential. Steganography is a technique to hide, while cryptography is a technique to encode. The combination of the two techniques produces a better security system. This paper proposed a combination of steganography and cryptography by using Discrete Cosine Transform (DCT), One Time Pad (OTP) and PN-Sequence implemented on a digital image. The test and measurement method used to determine the quality of stego image or final image is using Peak Signal to Noise Ratio (PSNR) and Mean Square Error (MSE). On the other hand, Normalized Correlation Coefficient (NCC) is used to measure the quality of extraction and decryption messages from the proposed StegoCrypt method. The experimental results of this study get better results compared to previous studies where this technique has better imperceptibility and is more resistant to JPEG compression, median filter, and crop attacks.