Knowledge of cryptographic techniques used to belong almost exclusively to governments, which use cryptography to protect political, diplomatic and military secrets against the prying eyes of other governments. Historically, governments took steps to restrict the spread of cryptographic knowledge. Cryptographic activities . . .
Knowledge of cryptographic techniques used to belong almost exclusively to governments, which use cryptography to protect political, diplomatic and military secrets against the prying eyes of other governments. Historically, governments took steps to restrict the spread of cryptographic knowledge. Cryptographic activities were conducted in secret departments, some actually called "Black Chambers." Cryptographic texts were suppressed or classified. Knowledge was passed from person to person, from master to apprentice. Trade in cryptographic information or equipment was banned. The field of cryptography was intentionally cloaked in mystery.