Simple authentication protocols are subject to reflection
					attacks if a malicious user can use the target machine to impersonate a trusted
					user.A mutual authentication protocol requires each party to respond to a
						random challenge by the other party by encrypting it with a pre-shared key.
						Often, however, such protocols employ the same pre-shared key for
						communication with a number of different entities. A malicious user or an
						attacker can easily compromise this protocol without possessing the correct
						key by employing a reflection attack on the protocol.