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Because MACs use secret keys, they do not necessarily need to be encrypted to provide the same level of assurance.

Message digests do not use secret keys and, when taken on their own, are therefore a much less reliable gauge of message integrity than MACs. Conversely, MAC algorithms are designed to produce matching MACs only if the same message, secret key and initialization vector are input to the same algorithm.

Message digest algorithms are created such that a given message will always produce the same message digest assuming the same algorithm is used to generate both. This lack of security means that any message digest intended for use gauging message integrity should be encrypted or otherwise be protected against tampering. However, some authors use MIC to refer to a message digest, which is different from a MAC – a message digest does not use secret keys.

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The term message integrity code (MIC) is frequently substituted for the term MAC, especially in communications, to distinguish it from the use of MAC meaning MAC address (for media access control address). This is commonly done in the finance industry.

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However, non-repudiation can be provided by systems that securely bind key usage information to the MAC key the same key is in the possession of two people, but one has a copy of the key that can be used for MAC generation while the other has a copy of the key in a hardware security module that only permits MAC verification. Thus, digital signatures do offer non-repudiation. Since this private key is only accessible to its holder, a digital signature proves that a document was signed by none other than that holder. In contrast, a digital signature is generated using the private key of a key pair, which is public-key cryptography. For the same reason, MACs do not provide the property of non-repudiation offered by signatures specifically in the case of a network-wide shared secret key: any user who can verify a MAC is also capable of generating MACs for other messages. This implies that the sender and receiver of a message must agree on the same key before initiating communications, as is the case with symmetric encryption.

MACs differ from digital signatures as MAC values are both generated and verified using the same secret key. Today, that spirit of cooperation still drives us.

Mountain America Credit Union opened its doors in the 1930s with a simple goal-to help our fellow members financially.

Amenities include restaurants, banquet halls, swimming pools, exercise rooms and courts of all sizes.

Welcome to MAC Founded in 1891, MAC today serves 22,000 members in 600,000 square feet of recreation and event space in downtown Portland.

While Apple's Magic Mouse may seem like it is a single button, clicking it from the right side produces a right-click. In addition, you can hook up the mouse you use on your Windows PC to a Mac.

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The Mac OS supports both a left-click and a right-click for the mouse. How a Mac and a Windows-Based PC Are Different.

Devin Overstreet may be the class valedictorian, but he hasn't had much life experience. A high school whiz kid and pot-hazed senior team up to graduate with distinction - and a case of the munchies.