Editing Replay attack (section)

{{Short description|Network attack in which valid data transmission is repeated or delayed}}

A '''replay attack''' (also known as a '''repeat attack''' or '''playback attack''') is a form of [[Computer network|network]]<ref name=":1" /> attack in which valid data transmission is maliciously or fraudulently repeated or delayed.<ref name=":1">{{Cite journal|last1=El Abbadi|first1=Reda|last2=Jamouli|first2=Hicham|date=2021-01-25|editor-last=Moreno-Valenzuela|editor-first=Javier|title=Takagi–Sugeno Fuzzy Control for a Nonlinear Networked System Exposed to a Replay Attack|journal=Mathematical Problems in Engineering|language=en|volume=2021|pages=1–13|doi=10.1155/2021/6618105|issn=1563-5147|doi-access=free}}</ref> This is carried out either by the originator or by an [[Adversary (cryptography)|adversary]] who intercepts the data and re-transmits it, possibly as part of a [[spoofing attack]] by [[IP packet (disambiguation)|IP packet]] substitution. This is one of the lower-tier versions of a [[man-in-the-middle attack]]. Replay attacks are usually passive in nature.

Another way of describing such an attack is:
"an attack on a [[security protocol]] using a replay of messages from a different context into the intended (or original and expected) context, thereby fooling the honest participant(s) into thinking they have successfully completed the protocol run."<ref name=":0">{{cite web|last1=Malladi|first1=Sreekanth|title=On Preventing Replay Attacks on Security Protocols|url=https://apps.dtic.mil/dtic/tr/fulltext/u2/a462295.pdf|archive-url=https://web.archive.org/web/20220120144617/https://apps.dtic.mil/dtic/tr/fulltext/u2/a462295.pdf|url-status=live|archive-date=January 20, 2022|website=oai.dtic.mil}}</ref>