Performance Analysis of DWT and 4-LSB for Information Hiding in Images (Steganography)

Abstract

Steganographic techniques allow one party to communicate information to another without a third party knowing that the communication is occuring. Steganography works by replacing bits of useless or unused data in regular computer files with bits of different, invisible information. This paper presents the performance analysis for two steganographic algorithms, DWT and 4-LSB algorithm. 4-LSB algorithm works in spatial domain, where dimension can be any size. DWT algorithm works in frequency domain, where there are two dimensions, time and frequency. This system is implemented to hide image and text in the container image. According to experimental results, the similarity of extracted image and secret image by 4-LSB is higher than those of DWT but steganography by DWT method can resist to attacks more than 4-LSB algorithm.