No-cloning principal can alone provide security

TL;DR

This paper argues that the no-cloning principle alone can ensure security in quantum communication, eliminating the need for classical authentication and enabling quantum passwords that are not secret.

Contribution

It demonstrates that the no-cloning principle can independently provide security and authentication in quantum cryptography, challenging the reliance on classical schemes.

Findings

No-cloning principle can ensure security without classical support

Quantum passwords need not be secret passwords

Quantum authentication can be achieved solely through quantum principles

Abstract

Existing quantum key distribution schemes need the support of classical authentication scheme to ensure security. This is a conceptual drawback of quantum cryptography. It is pointed out that quantum cryptosystem does not need any support of classical cryptosystem to ensure security. No-cloning principal can alone provide security in communication. Even no-cloning principle itself can help to authenticate each bit of information. It implies that quantum password need not to be a secret password.