  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
