VLSI Implementation of Image Encryption Using DNA Cryptography

Image security is emerging as a major problem with the exponential growth of data stored and transformed through the network around the world. Many cryptographic techniques are used for securing the data like images, audio and text files. Anew technique ofDNAcryptography provides high security based on DNA nucleotides bases A-Adenine, C-Cytosine, G-Guanine and T-Thymine. These alphabets can be easily assigned to binary values (A-00,C-01,G-10,T-11). In this proposed model Polymerase Chain Reaction encoding technique is used in which the image to be encoded is flanked between primer keys. The DNA codons are encoded by the base of four provides keys of 256 combinations for high security, and it reduces the size of cipher text. Primer keys are generated by pseudo random sequence generator. Deciphering the image is possible with encryption key and primer sequence key. The HDL synthesis report for hardware design is implemented for encryption using verilog code on a device Virtex VII.