Man in the middle and current injection attacks against the KLJN key exchanger compromised by DC sources
This addresses security vulnerabilities in quantum-resistant key exchange systems for cryptography applications, but it is incremental as it builds on prior proofs of immunity.
The study investigated how parasitic DC sources in the KLJN key exchanger affect active attacks like man-in-the-middle and current injection, finding that these sources increase security by making eavesdropping easier to detect, with some cases reverting to the original immune attack.
This study addresses a new question regarding the security of the Kirchhoff-Law-Johnson-Noise (KLJN) scheme compromised by DC sources at Alice and Bob: What is the impact of these parasitic sources on active attacks, such as the man-in-the-middle (MITM) attack, or the current injection attack? The surprising answer is that the parasitic DC sources actually increase the security of the system because, in the case of the MITM attack, they make easier to uncover the eavesdropping. In some of the cases Eve can fix this deficiency but then the problem gets reduced to the original MITM attack to which the KLJN scheme is immune, it is already as proven earlier