A new Mac: LAMA

In this paper, we will propose a MAC with two versions, which is called LAMA. The proposal MAC has the input size of 128 bits and 256 bits in the versions 1, 2 respectively, and output size of 128 bits. There have not been found a attack better than the exhaustive search attack for the MAC, and it has a fast implementations in about 5 / cycles byte in the both versions.