The National Security Agency has released under FOIA nine crypto papers in
response to a request for informaton on Non-Secret Encryption filed in
October 1999. Three
of the papers were formerly classified Top Secret Codeword, one was formerly
classified Secret and were declassified for this request.
For a description of Non-Secret Encryption see
“The Story of Non-Secret
Encryption,” J. H. Ellis.
NSA wrote that this
is an initial release and additional documents may be provided later. The
documents were received on 28 February 2007, scanned and converted to PDF.
All nine PDFs:
More information available on Cryptome.