Data Hiding Scheme using 14 Squares Substitution Cipher & Index Variable

Abstract
Authors
Keywords
Conclusion
References

In this paper we are proposing a technique for hiding the important data using the technique of cryptography and steganography. Firstly, we encrypt the data using the proposed substitution cipher algorithm, and then embed the cipher text in the carrier image. At a single point of time, we will be using only 2-bit combination. This method first finds the total bytes of the data that has to be hidden. The selection of the bit position of the carrier image depends on the value of an index variable. Here the 6th bit means the LSB minus two locations, the 7th bit means the LSB minus one location and 8th bit means the least significant bit (LSB) location. The index value will change from 0 to 1 or 1 to 2 or 2 to 0 after each embedding. Before sending the embedded image the data is locked with a security id. Due to the security lock and the image bytes which depend on the size of the cipher text, this method is a stronger approach.

Published In : IJCAT Journal Volume 1, Issue 6

Date of Publication : 31 July 2014

Pages : 308 - 311

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Publication Link : Data Hiding Scheme using 14 Squares Substitution Cipher & Index Variable

Milind S. Deshkar : Qualification : M.Tech(CSE) Pursuing Deapartment: CSE College: RCERT, Chandrapur

P. S. Kulkarni : Qualification : M.Tech, PhD.(Pursuing) Deapartment: IT College: RCERT, Chandrapur

Steganography

cryptography

LSB

Fourteen square cipher

index variable

The carrier image is transformed into binary form. Each pixel becomes 1 byte. The cipher text of the secret message is converted into bytes. Now calculate the number of bytes, suppose it is n. Divide it by 2, say it is x. The x called as the index variable. The value x=0, corresponds to 6th and 7th bit locations, x=1 corresponds to 7th and 8th bit locations, of any pixel (byte) of the digital image. If present value of x=0 hide the two bits of cipher text in 6th and 7th bit locations of the present pixel (byte), and next value of x is 1 for the next pixel. If present value of x=1 hide the two bits of cipher text in 7th and 8th bit locations of the present pixel (byte), and next value of x is 0 for the next pixel. After embedding the text to the carrier image, the security id is entered. This security id is sent through communication to the receiver. This security id is needed in the reverse process to extract the secret message.

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