The message is divided into groups, each group contains five characters of eight bits each.These characters are xored together. For example, if the message inputs $($characters$)$ areA, B$,$ C$,$ D$,$ E$,$ the result of the first step isA $($Xor$)$ B $($xor$)$ C $($xor$)$ D $($xor$)$ E$.$ The result will consists of eight bits. In the second step, the result of the first step is xored with the key to obtain the MAC. For our message, the MAC is

MAC$=10011101$

The secret key isK $=11111111$

We received three different messages as follows:$1.$ Message $1$:$011010000110010101101100011011000110111122.$ Message $2$:$01101001011001010110110001101100011011113.$ Message $3$:$0110100101100101011011000110110000101111($a$)$ Which of the messages above has been altered? show your work and explain.