What is the full form of CMAC code based Mac cipher-based Mac construct based Mac?

What is the full form of CMAC code based Mac cipher-based Mac construct based Mac?

Clarification: CMAC stands for cipher-based message authentication code.

Is Mac and CMAC the same?

CMAC is a simple variant of the CBC MAC (Cipher Block Chaining Message Authentication Code). Whereas the basic CBC MAC is only secure on messages of one fixed length (and that length must be a multiple of the block size), CMAC takes and is secure across messages of any bit length.

What is a CMAC tag?

Cipher-based message authentication codes (or CMACs) are a tool for calculating message authentication codes using a block cipher coupled with a secret key. You can use an CMAC to verify both the integrity and authenticity of a message.

How is CMAC calculated?

CMAC is equivalent to OMAC1. To generate an ℓ-bit CMAC tag (t) of a message (m) using a b-bit block cipher (E) and a secret key (k), one first generates two b-bit sub-keys (k1 and k2) using the following algorithm (this is equivalent to multiplication by x and x2 in a finite field GF(2b)).

What is the difference between CMAC and HMAC?

Generally CMAC will be slower than HMAC, as hashing methods are generally faster than block cipher methods. In most cases HMAC will work best, but CMAC may work better where there is embedded hardware which has hardware accelleration for block ciphers. For this, CMAC would likely run faster than HMAC.

Is CBC Mac collision resistant?

This example also shows that a CBC-MAC cannot be used as a collision-resistant one-way function: given a key it is trivial to create a different message which “hashes” to the same tag.

Is CBC-Mac collision resistant?

What is CMAC on router?

The CM MAC (Cable Modem MAC address) and Serial Number of your cable modem are printed on the bottom label.

Is CBC-MAC collision resistant?

Is MAC better than HMAC?

The main difference between MAC and HMAC is that MAC is a tag or a piece of information that helps to authenticate a message, while HMAC is a special type of MAC with a cryptographic hash function and a secret cryptographic key. Cryptography is the process of sending data securely from the source to the destination.

What’s the main benefit of a CBC-MAC?

This provides semantic security, by means of ensuring the same plain text is not encrypted to the same cipher text, allowing an attacker to infer a relationship exists. When computing a message authentication code, such as by CBC-MAC, the use of an initialization vector is a possible attack vector.