New Improved and Robust Watermarking Technique based on 3 rd LSB substitution method

With the rapid development and wide use of Internet, information transmission faces a big challenge of security. People need a safe and secured way to transmit information. Encryption is a common method, which is used for encrypting information. But it is easier to attract the attention of the attackers because the information cannot be read directly. The information will be intercepted, deciphered, and even retransmitted after sabotage; therefore, the integrity of the information is destroyed. Many watermarking algorithms have been proposed in recent years. This paper presents a new watermarking technique which is based on least significant bits (LSB) substitution method .our proposed algorithm is improved version LSB substitution method. In this method we used traditional extraction of two shares with separate transparency of secret image for security purpose. We take two different cover images for covering the secret share. Then one secret bit from a secret share is randomly embedded into the ri-th least significant bit (LSBri) of a cover image. Our scheme uses a pseudo random number generator with a secret seed SD to generate a sequence of random numbers {r1, r2...rm}, where m = (2W ×2H) and ri ≤ L. Here, L is the number of least significant bits. we proposed this algorithm for L = 3.