What does Message Authentication Code mean on MAC?

What does Message Authentication Code mean on MAC?

A message authentication code (MAC), or tag, is a security code that is typed in by the user of a computer to access accounts or portals. This code is attached to the message or request sent by the user.

What are the requirements of a message authentication code MAC?

A message authentication code (MAC) is a cryptographic checksum on data that uses a session key to detect both accidental and intentional modifications of the data. A MAC requires two inputs: a message and a secret key known only to the originator of the message and its intended recipient(s).

Does MAC provide message authentication?

MAC algorithm is a symmetric key cryptographic technique to provide message authentication. For establishing MAC process, the sender and receiver share a symmetric key K. Essentially, a MAC is an encrypted checksum generated on the underlying message that is sent along with a message to ensure message authentication.

Does MAC provide authentication or confidentiality justify your answer?

In this model of MAC, sender encrypts the content before sending it through network for confidentiality. Thus this model provides confidentiality as well as authentication.

What is the meaning of authentication code?

authentication code An appendage to a message that indicates to the recipient whether the message has been tampered with during transit. Authentication codes can be derived cryptographically as a function of the message and a secret key held by the sender and recipient. See also cryptography.

What are the different message authentication codes?

These include: FIPS PUB 113 Computer Data Authentication, withdrawn in 2002, defines an algorithm based on DES. FIPS PUB 198-1 The Keyed-Hash Message Authentication Code (HMAC) ISO/IEC 9797-1 Mechanisms using a block cipher.

How does a message authentication code ( MAC ) work?

In this threat, the user is not sure about the originator of the message. Message authentication can be provided using the cryptographic techniques that use secret keys as done in case of encryption. MAC algorithm is a symmetric key cryptographic technique to provide message authentication.

How are message authentication codes and confidentiality calculated?

Message authentication and confidentiality (Authentication tied to ciphertext) : The message is encrypted and then MAC is calculated using the resulting ciphertext and is concatenated to the ciphertext to form transmitted block. Requirements of Message Authentication Code and MD5 algorithm.

Are there any limitations to MAC message authentication?

As a bottom-line, a receiver safely assumes that the message is not the genuine. There are two major limitations of MAC, both due to its symmetric nature of operation − Establishment of Shared Secret. It can provide message authentication among pre-decided legitimate users who have shared key.

What kind of cryptography is used for message authentication?

Message authentication can be provided using the cryptographic techniques that use secret keys as done in case of encryption. Message Authentication Code (MAC) MAC algorithm is a symmetric key cryptographic technique to provide message authentication. For establishing MAC process, the sender and receiver share a symmetric key K.