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When you enter a card number online, it could be intercepted by a man-in-the-middle attack or exposed in a data breach. Digital wallets are more secure, but if you must enter a card number to complete an online transaction, virtual card numbers can help protect your main account. These temporary numbers can be set to close after a time limit or granted access to a maximum dollar amount. Some third-party companies offer this service while financial organizations like Capital One and Citibank also provide the feature.