salami attack
n. A series of minor computer crimes—slices of a larger crime—that are difficult to detect and trace.

Example Citation:
"According to one knowlegdeable source, another hacker brags that he recently found a way to get into Citibank's computers. For three months he says he quietly skimmed off a penny or so from each account. Once he had $ 200,000, he quit. Citibank says it has no evidence of this incident and we cannot confirm the hacker's story. But, says computer crime expert Donn Parker of consultants SRI International: 'Such a salami attack is definitely possible, especially for an insider.' "
—William G. Flanagan and Brigid McMenamin, " 'The playground bullies are learning how to type'," Forbes

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