Experimental quantum secure network with digital signatures and encryption.

Area of Science:

• Quantum Information Science
• Cryptography
• Network Security

Background:

• Cryptography provides essential security services like confidentiality, integrity, authenticity, and non-repudiation for digital transactions.
• Developing efficient digital signatures with information-theoretical security remains a significant challenge in cryptography.

Purpose of the Study:

• To propose a high-efficiency quantum digital signature (QDS) protocol.
• To address the urgent need for secure and efficient digital signatures in the digital economy.

Main Methods:

• Utilized asymmetric quantum keys acquired via secret sharing.
• Employed one-time universal hashing and a one-time pad for signature generation.
• Developed a novel quantum secure network integrating multiple cryptographic functionalities.

Main Results:

• Achieved a security bound of 10^-19 for signing documents up to 2^64 bits using a 384-bit key.
• Demonstrated over 10^8 times improvement in signature efficiency for a one-megabit document compared to prior QDS protocols.
• Successfully built and experimentally validated the first all-in-one quantum secure network.

Conclusions:

• The proposed QDS protocol significantly enhances signature efficiency and security.
• The developed quantum secure network integrates communication, digital signatures, secret sharing, and key agreement.
• This work completes the cryptographic toolbox by providing all four essential information security objectives.