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In this paper, the vulnerability of the Vadai, Mingesz and Gingl (VMG)-Kirchhoff-Law-Johnson-Noise (KLJN) Key Exchanger (Nature, Science Report 5(2015) 13653) against two active attacks is demonstrated. The securityvulnerability arises from the fact that the effective driving impedances aredifferent between the HL and LH cases for the VMG-KLJN scheme; whereas for theideal KLJN scheme they are same. Two defense schemes are shown against theseattacks but each of them can protect against only one of the attack types; butnot against the two attacks simultaneously. The theoretical results areconfirmed by computer simulations.

Current injection and voltage insertion attacks against the VMG-KLJN secure key exchanger