as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
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give an example of a widely used service that uses implicit authentication.
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one example of widely used service that uses implicit authentication is online banking services. banks require customers to use a username and password combination to access their account through a web portal, but banks can also recognize customers attempting to login from their device or the same ip address. banks will often allow access to a customer's account if it detects activity that can be linked to a customer, such as a stored cookie, which serves as an implicit authentication. this helps prevent fraud, since the customer's device or ip address must match their account to gain access.
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