Julia Kagan is a financial/consumer journalist and former senior editor, personal finance, of Investopedia. A message authentication code (MAC), or tag, is a security code that is typed in by the user ...
Vector flat phone chat bubbles. Sms messages. Speech bubbles. Short message service bubbles.(Getty Images/iStockphoto/Ihor Kashurin) Q: I received a text message from 77958 with a security code for ...
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