Optimal Key Size of the AVK for Symmetric Key Encryption

Abstract

The security of AVK based cryptosystem can be enhanced merely by exchanging the key using parameters. Today, the major challenge we face in design of AVK model of symmetric key encryption is fixing key length for AVK. On deeper scrutiny, it was revealed that a key of shorter length increases vulnerability of the system. On the other hand, key length beyond optimum length involves unnecessary overheads (suboptimum utilization of bandwidth). Thus, this paper resolves the conundrum of research questions, and answers estimation of optimum key size for AVK model. The paper provides useful insights towards decision making for optimal key length.