Four key Secured Data Transfer Using Steganography and Cryptography

摘要

Steganography and cryptography are used to send the data in a confidential way. Steganography hides the existing message and cryptography will confuse the message. The transformation of plain text to cipher text is called as encryption. The transformation of cipher text to plain text is called decryption. Encryption and decryption are controlled by keys. Hashing, symmetric and asymmetric algorithms are cryptographic techniques. There is a difficulty to find the hidden messages. For this purpose various transformations like DCT, FFT, FFT, and 2DDCT are used. A system is proposed in this paper to develop a new technique along with a newly enhanced security model in which cryptography and Steganography are used. In cryptography DES algorithm is used to encrypt a message and part of the message is hidden in 2DDCT of an image and the rest of the message will generate two secrete keys for the generation if high security