Generating Digital Signature Using DNA Coding

Abstract

This work focuses on signing the data with a signature using DNA coding for limited bandwidth systems or low computation systems. The proposed process has two modules. In first module, the sender generates a digital signature by signing the message using the DNA Coding Sequence. The second module is a hybrid of public key cryptography. A DNA symmetric key is generated, encrypted with DNA public key and shared with the intending recipient. Then the messages are exchanged using shared symmetric key. In both the modules, the work uses a simple non-linear function XOR to encrypt and decrypt the DNA coding sequence. The computation time required to perform the XOR operation matches the capabilities of limited bandwidth systems and suits our work. In addition the work also achieves high security in two levels, one is the secret matching of plain text letters to DNA Codon Sequence and the second is increase in the complexity of computation for breaking the algorithm using brute-force attack to square of the complexity achieved with 128-bit binary key, for the same length of DNA key.