Some very interesting declassified articles from the NSA Cryptologic Quarterly can be found at:
Cryptologic Quarterly Articles
http://www.nsa.gov/public_info/declass/cryptologic_quarterly.shtml
Some very interesting declassified articles from the NSA Cryptologic Quarterly can be found at:
Cryptologic Quarterly Articles
http://www.nsa.gov/public_info/declass/cryptologic_quarterly.shtml