Digest of Quantum Stream Cipher based on Holevo-Yuen Theory

TL;DR

This paper reviews the development of a quantum stream cipher based on Holevo-Yuen theory, aiming to provide a secure alternative to traditional cryptographic methods like OTP for quantum communication.

Contribution

It offers an overview and background of a novel quantum stream cipher that challenges the limitations of OTP in quantum cryptography.

Findings

Quantum stream cipher can potentially overcome OTP security issues.

The cipher is based on Holevo-Yuen quantum theory.

Recent publications have advanced understanding of this cipher.

Abstract

So far, quantum key distribution (QKD) has been the main subject in the field of quantum cryptography, but that is not quantum cryptographic communication, it is only the ability to send keys for cryptographic purposes. To complete cryptographic communication, a technique for encrypting data is necessary, and the conventional cryptographic technique of mathematical symmetric key cipher or One Time Pad (OTP) is adopted in the discussion so far. However, OTP is not the ultimate cipher for data encryption, because it does not satisfy security conditions in the modern cryptology. Around 2000, a new quantum stream cipher was proposed as a technique to challenge the possibility of overcoming drawbacks of OTP in practical use. Recently, we have published some review papers on it in Entropy (Open access journal), and others. This paper introduces an overview and a back ground of our paper that is entitled Quantum stream cipher based on Holevo-Yuen theory.