“Guide reveals that NSA ‘obtains cryptographic details of commercial cryptographic information security systems through industry relationships’”
National Security Agency, United States
<a rel="nofollow" class="external free" href="https://www.theguardian.com/world/interactive/2013/sep/05/nsa-classification-guide-cryptanalysis">https://www.theguardian.com/world/interactive/2013/sep/05/nsa-classification-guide-cryptanalysis</a>