After the terrorist attacks of 11 September 2001 , the NSA believed that it had public support for a dramatic expansion of its surveillance activities . According to Koblitz and Menezes , the period when the NSA was a trusted partner with academia and industry in the development of cryptographic standards came to an end when , as part of the change in the NSA in the post-September 11 era , Snow was replaced as Technical Director and could no longer effectively oppose proposed actions by the offensive arm of the NSA : In Snow 's last years at the NSA before his retirement in 2006 , along with Clinton Brooks he led a group that drew up a draft ethics code for intelligence officers
terrorist attacks of 11 September 2001
September 11 attacks
Brian Snow