Cryptography and image steganography using dynamic encryption on LSB and color image based data hiding
Hayfaa Abdulzahra Atee, Robiah Binti Ahmad, Norliza Mohd Noor · 2015
Cryptography and steganography are two conventional techniques used to cipher or hide information or data in existing communication. Cryptography is the art of saving information by encrypting it into an obscure format. On the other hand, steganography is the art and science of secret communication to send messages in a way which hides even the existence of the communication. In cryptography method, the message sends in an incomprehensible form in order to only the recipient can remove the disguise to extract and read the encrypted text. Conversely, in steganographic systems, the data embedded into a harmless digital media file like image, video, or audio and the file transmitted. Although cryptography and steganography provide an acceptable level of security when used separately via communicating in the unreliable medium like the Internet, advances in steganalysis make it a constantly evolving field. This paper aims to improve a new scheme of hiding a secret message in an image, by exploiting the benefits of combining cryptography and steganography. A new proposed encryption method is combined and tested with two steganographic methods separately in order to show and prove its performance and effectiveness. The two steganographic methods are Simple LSB and color image based data hiding (CIBDH). Experimental results are then evaluated in terms of imperceptibility, capacity and robustness. Results achieved indicate that the two proposed DELSB and DECIBDH methods are encouraging in terms of security, capacity and robustness.