просто must read.
secure..
(U) Use enciphered rather than secure when describing communications. The term secure describes the vulnerability of a signal to cryptologic attack.
(U) An enciphered signal is always enciphered, but whether it is secure depends on the cipher used.
http://www.governmentattic.org/4docs/NSA-SIGINT-style-manual_2010.pdf
secure..
(U) Use enciphered rather than secure when describing communications. The term secure describes the vulnerability of a signal to cryptologic attack.
(U) An enciphered signal is always enciphered, but whether it is secure depends on the cipher used.
http://www.governmentattic.org/4docs/NSA-SIGINT-style-manual_2010.pdf