A Study Upon Compression of Data Using Dct In Steganography Cryptography: An LSB & DCT-based Steganographic Method for Data Hiding

Abstract

Steganography and Cryptography are two popular ways of sending vitalinformation in a secret way. One hides the existence of the message and theother distorts the message itself.Steganography is a technique of hiding information in digital media. Incontrast to cryptography, it is not to keep others from knowing the hiddeninformation but it is to keep others from thinking that the information evenexists. In this paper, we propose a LSB & DCT-based Steganographic methodfor hiding the data. Each bit of data is embedded by altering the leastsignificant bit of low frequency DCT coefficients of cover image blocks.