DATA HIDING AND RETRIEVAL USING DIGITAL SIGNAL

ABSTRACT In the present work the authors have introduced a modified cryptographic method, called algorithm SKG 3.12, for data encryption and decryption of any text file, which is implemented in five phases (1) First, by converting each character into corresponding binary code using 8-bit ASCII Code thus we get 8N bits for a text of N characters (2) Secondly, creating a binary string of 0’s and 1’s such that total number of 0’s and 1’s is 8N, the consecutive numbers of 0’s and 1’s in this string may be from 1 to 7 (3) Thirdly, by swapping the integral multiple of leftmost N1 st bit with corresponding N1 st rightmost bit till 4Nth bit if remainder of (8N+1/N1) is zero otherwise upto 8Nth bit. (4) Fourthly, using XOR Gate on binary strings obtained at phases two and three and (5) Finally, converting binary string obtained at phase four into corresponding characters using 8-bit ASCII Code. This algorithm can be applied to any text consisting of 10 or more characters. The results obtained after application of this algorithm are difficult to decode. Keywords: Encryption, Decryption, XOR Gate, swapping of bits Volume & Issue No. = Volume 4, Issue 3, March 2016