Author : Ms. Chandraleka 1
Date of Publication :17th October 2017
Abstract: Steganography is the science of hiding data. It is the practice of concealing messages within other non-secret text, images or audio. The word steganography is derived from the greek word “ stegos †meaning “ cover †and “ grafia †meaning “ writing †defining it as covered writing. Steganography involves hiding information in such a manner that the third party is unaware about the existence of the data. Here, we are using RSA Algorithm in the 1st least significant (LSB Technique) and last 4 significant bits (Modulus 4 bit technique) of the pixel of image. In the RSA algorithm, the third party cannot identify the hidden information easily and even if the third party is able to access the encrypted data, no confidential information will be revealed. In the case of LSB, the data is hidden in the last 4 least significant bits of pixels of images which can’t be detected.MD5 hash algorithm is used to maintain data integrity. Use of hash algorithm provides data integrity. At the receiver’ s end, receiver first get data from image, decrypt it and then find message using the same algorithm and compare it with original message. If the message digest matches with the original message then the data is not tempered and accepted. Therefore, we have applied encryption using RSA and MD5 hash algorithm.
Reference :
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- Principles of Steganography by Max Weiss
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