Improvisation of Security Aspect in Steganography Applying DES

The unbelievable evolution of Internet technologies & its applications need very high level the security of data during transmission over the unsafe communication network. Image steganography is a technique for hiding information into a cover image. Least Significant-Bit (LSB) based approach is most common steganographic technique in spatial domain due to its easiness and hiding capacity. All of existing methods of steganography focus on the embedding strategy with less concern to the pre-processing, such as encryption of secrete image. The conventional algorithm does not provide the preprocessing required in image based steganography for better security, as they do not offer flexibility, robustness and high level of security. The proposed work presents a unique technique for Image steganography based on the Data Encryption Standard (DES) using 64 bit block size of plaintext & 56 bits of Secrete key. The preprocessing provide high level of security as extraction of image is not possible without the knowledge of mapping rules of S -Box and secrete key of the function.