Note that Eve, a third party eavesdropping on the conversation between Bob and Alice, cannot effectively manipulate the message. If they are the same, the message was not changed in transit. She compares the generated MAC value to the MAC value sent by Bob. Alice uses the secret key and the message as input to the MAC function.Bob sends the message and the MAC value to Alice over a network.Bob creates a message and inputs the message and the secret key into a MAC function to retrieve a MAC value.Bob and Alice share a secret key and agree on a MAC function to use.For example, consider the following scenario: A message authentication code (MAC) helps prevent message tampering. An altered message, even if the alteration results in nothing but nonsense, can have real costs. Message authentication codes (MACs)Įncryption helps prevent an unauthorized individual from reading a message, but it does not prevent that individual from tampering with the message. This article discusses how message authentication codes (MACs), hashes, and signatures can be used in Universal Windows Platform (UWP) apps to detect message tampering.
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