Editing C-52 (cipher machine) (section)

== Breaking and compromising ==
There is some speculation that the CX-52 might have been broken by the signals intelligence services of Communist [[East Germany]], [[Czechoslovakia]], and [[Polish People's Republic|Poland]].<ref>{{Cite journal|title = From the Archives: CX–52 Messages Read by Red Poles?|journal = Cryptologia|date = 2009-09-18|issn = 0161-1194|pages = 347–352|volume = 33|issue = 4|doi = 10.1080/01611190902742467|first = Jan|last = Bury|s2cid = 42774841}}</ref>

Many of the C-52 and CX-52 machines sold by Crypto AG were compromised to benefit the US and British national signals intelligence agencies, [[National Security Agency]] (NSA) and [[Government Communications Headquarters]] (GCHQ), respectively.<ref name=BBC-2015-07-28>{{cite news
|url=https://www.bbc.com/news/uk-33676028
|publisher=[[BBC]]
|title=How NSA and GCHQ spied on the Cold War world
|date=2015-07-28
|accessdate=2015-10-09
|last=Corera
|first=Gordon
|work=BBC News
}}</ref> For details, see [[Crypto AG#Compromised machines|Crypto AG § Compromised machines]].