Hybrid method using 3-DES, DWT and LSB for secure image steganography algorithm

摘要

Public networks such as the Internet are becoming more sophisticated, faster, and cheaper, so that more and more used for information exchange. This may increase the likelihood of confidential information from being stolen and exploited by unauthorized persons. This study proposed a combination of two Steganography domains coupled with Cryptography which aimed to make confidential information more secure and inaccessible to unauthorized persons. Messages are encrypted using the 3-DES method. On the other side of the cover image is decomposed into four subbands by using DWT. LH, HL, and HH subbands are chosen to embed encrypted message using LSB method. The last step, done Inverse DWT (IDWT) to get the stego image reconstruction. From the proposed method is then measured its quality with PSNR and MSE. As for message encryption results are measured using entropy. From the experiment results obtained PSNR results with a value of 55.30 dB for image messages size 64 * 64 and 49.23 dB for messages size 128 * 128. The extraction process can also be done perfectly with NC 1 and the average of Entropy of encrypted messages are 7.95754 for 64*64 and 7.98904 for 128*128.