Development of randomized hybrid cryptosystem using public and private keys

Abstract

Before the modern era, cryptography was concerned solely with message confidentiality (i.e., encryption), conversion of messages from a comprehensible form into an incomprehensible one and back again at the other end, rendering it unreadable by interceptors without secret knowledge (namely the key needed for decryption of that message). This paper presents a highly secured randomized encryption/decryption technique. Implementation presented in this paper chooses a randomly switching model which combines the symmetric cryptosystem Advanced Encryption Standard (AES) and asymmetric cryptosystem elliptic curve cryptography (ECC) to work together as a single unit. Symmetric algorithms provide high confidentiality using a single key, incorporating low power and memory resources. Asymmetric algorithms provide strong security strength using a pair of keys enabling rapid implementations. This model being implemented on FPGA provides excellent area results, and a higher level of security is achieved. © 2014 Springer India.