How do you secure a workplace with shared printers and PCs?

How can you ensure the security of a workplace when people often use the same printer and computer?

What protections can you use to protect your computer against power surges, and what further precautions can you take to ensure that it will not be compromised?

(a) Find the Hamming distance between the codewords that correspond to datawords 0111 and 1100. (b)  Suppose the Hamming distance you found in part (a) is the minimum Hamming distance between all pairs in the codebook. What does this tell us about the number of errors this code can detect?