A capture-replay flaw exists when the design of the software
					makes it possible for a malicious user to sniff network traffic and bypass
					authentication by replaying it to the server in question to the same effect as
					the original message (or with minor changes).Capture-replay attacks are common and can be difficult to defeat without
						cryptography. They are a subset of network injection attacks that rely on
						observing previously-sent valid commands, then changing them slightly if
						necessary and resending the same commands to the server.