The numeric complement of -123 is 123.

[…]the irregularities of the first motions , violent assaults , and importunities of temptations , sudden incursions , and obreptions, sins of mere ignorance and inadvertency […]

This act was not merely wrong; it was clearly done with malice aforethought.

Given crackers' propensity for rootkitting systems — installing altered system binaries to facilitate future access — systematic integrity checks using message digest algorithms or one-way hash functions can be an important detection safeguard.