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A common attack in DeFi is the sandwich attack. Upon observing a trade of asset X for asset Y, an attacker front-runs the victim trade by also buying asset Y, lets the victim execute the trade, and then executes another trade after the victim by trading back the amount gained in the first trade. Intuitively, one uses the knowledge that someone’s going to buy an asset, and that this trade will increase its price, to make a profit. The attacker’s plan is to buy this asset cheap, let the victim buy at an increased price, and then sell the received amount again at a higher price afterwards.