Confidence fraud

Definition
Confidence fraud is the reliance on another’s discretion and/or a breach in a relationship of trust resulting in financial loss. It includes a knowing misrepresentation of the truth or concealment of a material fact to induce another to act to his or her detriment. Auction fraud and non-delivery of payment or merchandise are both types of confidence fraud. The Nigerian letter scam is another example of confidence fraud.

Source
Internet Crime Complaint Center, 2008 Internet Crime Report, at 16.