Cryptography architecture for information security

SNA provides the foundation for the orderly movement of information from source to destination in a communications network. The addition of a cryptography function, as a means of protecting information from disclosure or deliberate modification during passage through the network, affects the architecture in terms of selection, distribution, and verification of the function. By associating cryptography and an architecture, an otherwise unprotected communications facility or portable storage medium becomes practically as secure as a physically protected host processing center.