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Two New Approaches for Secured Image Steganography Using Cryptographic Techniques and Type Conversions

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Author(s): Sujay Narayana | Gaurav Prasad

Journal: Signal & Image Processing
ISSN 2229-3922

Volume: 1;
Issue: 2;
Start page: 60;
Date: 2011;
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Keywords: Steganography | Cryptography | image hiding | least-significant bit (LSB) method

ABSTRACT
The science of securing a data by encryption is Cryptography whereas the method of hiding secretmessages in other messages is Steganography, so that the secret’s very existence is concealed. The term‘Steganography’ describes the method of hiding cognitive content in another medium to avoid detectionby the intruders. This paper introduces two new methods wherein cryptography and steganography arecombined to encrypt the data as well as to hide the encrypted data in another medium so the fact that amessage being sent is concealed. One of the methods shows how to secure the image by converting it intocipher text by S-DES algorithm using a secret key and conceal this text in another image bysteganographic method. Another method shows a new way of hiding an image in another image byencrypting the image directly by S-DES algorithm using a key image and the data obtained is concealedin another image. The proposed method prevents the possibilities of steganalysis also.
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