Example Usage
A business that suffers from attackers that place fraudulent Internet orders may insist that all its customers deposit a secret symmetric key with them. Along with an order, a customer must supply the order's HMAC digest, computed using the customer's key. The business, knowing the customer's key, can then verify that the order originated from the stated customer and has not been tampered with.
Read more about this topic: Hash-based Message Authentication Code
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