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A recent IEEE Access Paper by Gunn, Allison and Abbott (GAA) proposed a new transient attack against the Kirchhoff-law-Johnson-noise (KLJN) secure key exchange system. The attack is valid, but it is easy to build a defense for the KLJN…

Cryptography and Security · Computer Science 2018-08-19 Laszlo Bela Kish , Claes Goran Granqvist

We introduce a protocol with a reconfigurable filter system to create non-overlapping single loops in the smart power grid for the realization of the Kirchhoff-Law-Johnson-(like)-Noise secure key distribution system. The protocol is valid…

Cryptography and Security · Computer Science 2013-12-18 Elias Gonzalez , Laszlo B. Kish , Robert Balog , Prasad Enjeti

The information theoretically secure Kirchhoff-law-Johnson-noise (KLJN) key exchange scheme, similarly to quantum key distribution (QKD), is also potentially vulnerable against clock attacks, where Eve takes over the control of clock…

Cryptography and Security · Computer Science 2022-07-15 Laszlo B. Kish

The security of the Kirchhoff-law-Johnson-(like)-noise (KLJN) key exchange system is based on the Fluctuation-Dissipation-Theorem of classical statistical physics. Similarly to quantum key distribution, in practical situations, due to the…

Emerging Technologies · Computer Science 2015-11-23 Hsien-Pu Chen , Elias Gonzalez , Yessica Saez , Laszlo B. Kish

This letter proposes a novel hybrid key distribution architecture that jointly exploits quantum key distribution (QKD) and Kirchhoff-law-Johnson-noise (KLJN) statistical-physical key exchange. In the proposed system, an optical BB84-type…

Quantum Physics · Physics 2026-05-18 Ertugrul Basar

In this paper, we survey the state of the art of the secure key exchange method that is secured by the laws of classical statistical physics, and involves the Kirchhoff's law and the generalized Johnson noise equation, too. We discuss the…

Cryptography and Security · Computer Science 2012-06-07 Laszlo B. Kish , Ferdinand Peper

It has been shown recently that the use of two pairs of resistors with enhanced Johnson-noise and a Kirchhoff-loop-i.e., a Kirchhoff-Law-Johnson-Noise (KLJN) protocol-for secure key distribution leads to information theoretic security…

Emerging Technologies · Computer Science 2016-11-17 R. Mingesz , L. B. Kish , Z. Gingl , C. G. Granqvist , H. Wen , F. Peper , T. Eubank , G. Schmera

This paper demonstrates the vulnerability of the Kirchhoff-Law-Johnson-Noise (KLJN) secure key exchanger to compromised random number generator(s) even if these random numbers are used solely to generate the noises emulating the Johnson…

Cryptography and Security · Computer Science 2021-07-20 Christiana Chamon , Shahriar Ferdous , Laszlo Kish

This paper presents a statistical physical generation of random keys for a decentralized identity ecosystem that uses Web 3.0 protocols. Web 3.0 is driven by secure keys, typically represented in hexadecimal, that are pseudo-randomly…

Cryptography and Security · Computer Science 2023-12-29 Christiana Chamon , Kamalesh Mohanasundar , Sarah A. Flanery , Francis K. Quek

This dissertation demonstrates three new types of attacks against the KLJN scheme. The first attack type is based on compromised RNGs. The first RNG attacks are deterministic. First, Eve knows both noises. She can crack the bit via Ohm's…

Cryptography and Security · Computer Science 2021-12-17 Christiana Chamon

The no-cloning property of quantum mechanics allows unforgeability of quantum banknotes and credit cards. Quantum credit card protocols involve a bank, a client and a payment terminal, and their practical implementation typically relies on…

Quantum Physics · Physics 2019-02-28 Mathieu Bozzio , Eleni Diamanti , Frédéric Grosshans

This paper introduces and demonstrates two new attacks against the Kirchhoff-Law-Johnson-Noise (KLJN) secure key exchange scheme. The attacks are based on random number generators with compromised security. First we explore the situation in…

Cryptography and Security · Computer Science 2020-05-22 Christiana Chamon , Shahriar Ferdous , Laszlo B. Kish

The imperative need for unconditional secure key exchange is expounded by the increasing connectivity of networks and by the increasing number and level of sophistication of cyberattacks. Two concepts that are information theoretically…

Cryptography and Security · Computer Science 2015-04-27 Elias Gonzalez , Robert S. Balog , Laszlo B. Kish

This paper introduces and demonstrates four new statistical attacks against the Kirchhoff-Law-Johnson-Noise (KLJN) secure key exchange scheme. The attacks utilize compromised random number generators at Alice's/Bob's site(s). The case of…

Cryptography and Security · Computer Science 2021-10-08 Christiana Chamon , Shahriar Ferdous , Laszlo B. Kish

We point out that the claims in the comment-paper of Scheuer and Yariv are either irrelevant or incorrect. The idealized Kirchoff-loop-Johnson-like-noise (KLJN) scheme is totally secure therefore it is more secure than idealized quantum…

General Physics · Physics 2007-05-23 Laszlo B. Kish

The Kirchhoff-Law-Johnson-Noise (KLJN) secure key exchange scheme leverages statistical physics to enable secure communication with zero average power flow in a wired channel. While the original KLJN scheme requires significant power for…

Cryptography and Security · Computer Science 2025-06-04 Christiana Chamon

This study investigates a duality approach to information leak detection in the generalized Kirchhoff-Law-Johnson-Noise secure key exchange scheme proposed by Vadai, Mingesz, and Gingl (VMG-KLJN). While previous work by Chamon and Kish…

Cryptography and Security · Computer Science 2025-06-03 Sarah Flanery , Anson Trapani , Christiana Chamon , Leyla Nazhandali

A new attack against the Kirchhoff-Law-Johnson-Noise(KLJN) secure key exchange scheme is introduced. The attack exploits a parasitic (periodic) AC voltage-source at either Alice or Bob ends. Such situations exist due to AC ground loops and…

Cryptography and Security · Computer Science 2021-07-20 Mutaz Melhem , Christiana Chamon , Shahriar Ferdous , Laszlo B. Kish

First, we show a new inexpensive defense against intruders and the man-in-the-middle attack in the Kirchhoff's-loop-Johnson-like-noise (KLJN) cipher. Then instead of point-to-point communication, we propose a high efficiency, secure…

General Physics · Physics 2007-05-23 Laszlo B. Kish , Robert Mingesz

A new attack against the Kirchhoff-Law-Johnson-Noise (KLJN) key distribution system is explored. The attack is based on utilizing a parasitic dc-voltage-source in the loop. Relevant situations often exist in the low-frequency limit in…

Cryptography and Security · Computer Science 2018-10-04 Mutaz Y. Melhem , Laszlo B. Kish