Data appended to, or a cryptographic transformation of, a data unit that allows a recipient of the data unit to prove the source and integrity of the data unit and protect against forgery is a(n) .
a) security audit trail
b) digital signature
c) encipherment
d) authentication exchange

Most information security incidents will occur because of select one: a. users who do not follow secure computing practices and procedures b. increases in hacker skills and capabilities c. poorly designed network protection software d. increasing sophistication of computer viruses and worms