The fact, that pieces of Berlin Wall (torn down in 1989) became popular souvenirs is referenced in the line "Mit einem Stein in der Hand als Souvenir von der Mauer in Berlin/Klopfen wir an die Hintertür vom neuen Paradies" (With a stone in the hand as a souvenir from the wall in Berlin/We're knocking on the backdoor of the new paradise).
The backdoor progression can be found in popular jazz standards in such places as measures 7 and 8 of the A section of "Cherokee," measures 9 and 11 of "My Romance" or measures 10 and 28 of "There Will Never Be Another You," as well as Beatles songs like "In My Life" and "If I Fell."
The Guardian and The New York Times have reported that the National Security Agency (NSA) inserted a CSPRNG into NIST SP 800-90A that had a backdoor which allows the NSA to readily decrypt material that was encrypted with the aid of Dual EC DRBG.
The general cryptographic community was initially not aware of the potential backdoor, until of Dan Shumow and Niels Ferguson 2007 rediscovery, or of Certicom's Daniel R. L. Brown and Scott Vanstone's 2005 patent application describing the backdoor mechanism.
•
It was only after Dan Shumow and Niels Ferguson's 2007 presentation that the potential for a backdoor became widely known.
As reported in The Times of India article, based on uploaded secret memos dated October 6, 2011, international mobile manufacturers like RIM, Apple, and Nokia along with domestic Micromax have given "backdoor access" for digital surveillance to Indian military intelligence officials in exchange for doing business in Indian market.
Green's has blogged on and been cited in news articles on NSA's backdoor in Dual EC DRBG, and RSA Security's usage of the backdoored CSPRNG.