by the United States government

“ The term “communication intelligence” means all procedures and methods used in the interception of communications and the obtaining of information from such communications by other than the intended recipients ”

“ The term “unauthorized person” means any person who, or agency which, is not authorized to receive information of the categories set forth in subsection (a) of this section, by the President, or by the head of a department or agency of the United States Government which is expressly designated by the President to engage in communication intelligence activities for the United States. ”

“ The terms “code,” “cipher,” and “cryptographic system” include in their meanings, in addition to their usual meanings, any method of secret writing and any mechanical or electrical device or method used for the purpose of disguising or concealing the contents, significance, or meanings of communications ”