Where does spoofing collide?

In network security spoofing is forging the identifying fields of a communication so that it appears to come from a trusted source, most classically placing a false source address on IP packets to impersonate another host and bypass address-based trust. Bellovin's Security Problems in the TCP/IP Protocol Suite set out how the protocols' lack of source authentication enables this impersonation, including sequence-number attacks that let a forged packet be accepted. The referent is the falsification of identity or origin data in a networked system, assessed by whether a receiver can be made to accept fraudulent traffic. It is a different construct from the market-manipulation meaning that shares the word.[1]

Unit

A communication bearing a forged source identity accepted as genuine

Recovery means

Not applicable

Measured by

Assessed by whether a target accepts forged-origin traffic; countered by source authentication and ingress filtering

In financial markets spoofing is a manipulation tactic in which a trader submits large visible orders they intend to cancel before execution, creating a false impression of supply or demand to nudge the price, then trades on the other side at the improved level. It is explicitly prohibited as a deceptive practice in many jurisdictions. Cartea, Jaimungal, and Wang's Spoofing and Price Manipulation in Order-Driven Markets models how such non-bona-fide orders move prices in a limit order book. The referent is a deceptive order-placement strategy, unrelated to forging packet headers beyond the shared idea of a convincing fake.[2]

Unit

Non-bona-fide orders placed to mislead others about supply or demand

Recovery means

Not applicable

Measured by

Detected through order-to-trade ratios, rapid cancellations, and order-book imbalance around a trader's fills