CompTIA Security+ Exam Prep

Answer: D - A one-way hash is a function that takes a variable-length string and message and produces a fixed-length value called a hash value. This is called a message fingerprint. The secrecy of the one-way hashing function is its “one-wayness.” The function is run in only one direction, not in reverse. The receiver does not attempt to reverse the process at the other end, but instead runs the same hashing function one way and compares the two results. The hashing one-way function takes place without the use of any keys. At this point, the function is called MAC.