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A control for a company that wants to prevent virus-infected
programs (or other type of unauthorized modified programs)
would be to:
A. utilize integrity checkers.
B. verify program's lengths.
C. backup the source and object code.
D. implement segregation of duties.
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Answer: A
Integrity checkers (such as the ones included in many
antivirus programs or freeware, like tripwire) compute for
each selected program some type of hash, checksum or cyclic
redundancy check (CRC), then store this number in a database
file. Before each execution of the program, the checker
recomputes the hash or checksum and compares it to the value
stored in the database. If the values do not match, the
program is not executed thus detecting a possible virus or
modified program. Verifying a progam's length is not
practical, and some virus do not affect the length of
infected programs. A backup of source and object code does
not help detect a modified program. Segregation of duties is
useful to minimize risk, however, it does not detect a
modified program.
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