A Crypto-Steganography: A Survey

The two important aspects of security that deal with transmitting information or data over some medium like Internet are steganography and cryptography. Steganography deals with hiding the presence of a message and cryptography deals with hiding the contents of a message. Both of them are used to ensure security. But none of them can simply fulfill the basic requirements of security i.e. the features such as robustness, undetectability and capacity etc. So a new method based on the combination of both cryptography and steganography known as Crypto-Steganography which overcome each other’s weaknesses and make difficult for the intruders to attack or steal sensitive information is being proposed. This paper also describes the basics concepts of steganography and cryptography on the basis of previous literatures available on the topic. Keywords—Steganography; Image Steganography; Cryptography; Least Significant Bit (LSB); Enhanced Least Significant Bit (ELSB); Compression; Decompression; Advanced Encryption Standard (AES); Data Encryption Standard (DES); Hashing algorithms