Secret Data Transmission using Vital Image Steganography over Transposition Cipher

The idea behind this paper describes a modality about secret interface over the globalization of the communication over the world. To accomplish this phenomenon, two varieties of security mechanism, cryptography and steganography is being applied. At the former stage, encryption is being provided to secret plain text using Vernam cipher (One-Time Pad) transposition technique, since Vernam cipher show good performance metrics in terms of less CPU running time, file size same after encryption and strong avalanche effect compare with all transposition cipher. And at the later stage, it transform cipher text into bytes and divides each byte into pairs of bits and assigns the decimal values to each pairs, which is known as master variable. master variable value range will be vary between 0 to 3. Depending upon the master patchy value, add that cipher text in the career image at Least Significant Bit (LSB) 6 th and 7 th bit location or 7 th and 8 th bit location or 7 th and 6 th or 8 th and 7 th bit location. Which shows the embedding location dynamicity of the algorithm depends upon dynamically changed master variable value. After completion of embedding and sending the stego image to the receiver side, retrieving process of the cipher text from the said locations will be done. And then decryption process to get the secret plain text back will be performed using the Vernam cipher transposition algorithms. In this we provide robust image steganography. Performance analysis observed using MSE and PSNR value.