Nonlinearity Attack Against the Kirchhoff-Law-Johnson-Noise (KLJN) Secure Key Exchange Protocol Academic Article uri icon


  • This paper introduces a new attack against the KirchhoffLawJohnson-Noise (KLJN) secure key exchange scheme. The attack is based on the nonlinearity of the noise generators. We explore the effect of total distortion ([Formula: see text]) at the second order ([Formula: see text]), third order ([Formula: see text]) and a combination of the second and third orders ([Formula: see text]) on the security of the KLJN scheme. It is demonstrated that as little as 1% results in a notable power flow along the information channel, which leads to a significant information leak. We also show that decreasing the effective temperature (that is, the wire voltage) and, in this way reducing nonlinearity, results in the KLJN scheme approaching perfect security.

published proceedings


author list (cited authors)

  • Chamon, C., & Kish, L. B.

complete list of authors

  • Chamon, Christiana||Kish, Laszlo B