Effective Privacy Amplification for Secure Classical Communications

Abstract

We study the practical effectiveness of privacy amplification for classical key-distribution schemes. We find that in contrast to quantum key distribution schemes, the high fidelity of the raw key generated in classical systems allow the users to always sift a secure shorter key if they have an upper bound on the eavesdropper probability to correctly guess the exchanged key-bits. The number of privacy amplification iterations needed to achieve information leak of 10^-8 in existing classical communicators is 2 or 3 resulting in a corresponding slowdown 4 to 8. We analyze the inherent tradeoff between the number of iterations and the security of the raw key. This property which is unique to classical key distribution systems render them highly useful for practical, especially for noisy channels where sufficiently low quantum bit error ratios are difficult to achieve.

11 pages, 3 figures

Cited by in corpus (13)

• On the security of the Kirchhoff-law-Johnson-noise (KLJN) communicator
• Critical analysis of the Bennett-Riedel attack on secure cryptographic key distributions via the Kirchhoff-law-Johnson-noise scheme
• Errors and their mitigation at the Kirchhoff-law-Johnson-noise secure key exchange
• Elimination of a Second-Law-attack, and all cable-resistance-based attacks, in the Kirchhoff-law-Johnson-noise (KLJN) secure key exchange system
• Analysis of an attenuator artifact in an experimental attack by Gunn-Allison-Abbott against the Kirchhoff-law-Johnson-noise (KLJN) secure key exchange system
• Comments on the "Generalized" KLJN Key Exchanger with Arbitrary Resistors: Power, Impedance, Security
• Cable Capacitance Attack against the KLJN Secure Key Exchange
• Enhanced usage of keys obtained by physical, unconditionally secure distributions
• Deterministic Random Number Generator Attack against the Kirchhoff-Law-Johnson-Noise Secure Key Exchange Protocol
• AC Loop Current Attacks Against The KLJN Secure Key Exchange Scheme
• Perspective -- On the thermodynamics of perfect unconditional security
• Condition for the generation of the secret key in a BB84 like quantum key distribution protocol
• Information theoretic security by the laws of classical physics