Review of Designing Secured Data Using a Combination of LZW Compression, RSA Encryption, and DCT Steganography

Now a days the use of internet has been increased very much. Confidential data is been exchange over internet and various media file are also been exchange over internet. To keep these confidential data and media file secure over internet, then the cryptography and steganography technique are used to secure the data. So in this paper we are use various cryptography technique and steganography technique. Cryptography technique is use to encrypt the data. Steganography technique is use to hide the data within the selected image. . For that, we first substitute the original message by using the fourteen square substitution algorithms. After the substitution of text, we then encrypt this text message using RSA algorithm. The encrypted message compressed by JPEG 2000 (Huffman coding) method, so it will reduce the size of the message that will be inserted and increase the capacity of messages that can be inserted. Messages that have been compressed and encrypted, is then hidden by DWT (Discrete Wavelet Transform) techniques. With the incorporation of encryption techniques, steganography, and compression, the acquired information is more secure and its capacity is larger. At the receivers end, same operations are performed to decrypt the original message in reverse order. It is found that here we are using the double ciphering techniques which makes the system very robust and secures it from known hacking attacks. It makes very difficult for the intruders to hack the image and then decrypt the message in a feasible amount of time thus securing it from many known network attacks.