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Hotlines cannot be used to originate calls other than to preselected destinations. Various priority services that require dialing are not properly termed "hotlines."

Perhaps the most famous hotline was the so-called "red telephone" that linked the White House with the Kremlin during the Cold War. It was established in 1963 after the Cuban missile crisis made it clear that reliable, direct communications between the two great nuclear powers was a vital necessity. It was rumoured that this link was encrypted using the theoretically unbreakable one-time padIn cryptography, the one-time pad (OTP is a theoretically unbreakable method of encryption where the plaintext is combined with a random pad the same length as the plaintext. It is of central importance in cryptography because of this, though not widely u system.

Derived from Federal Standard 1037CFederal Standard 1037C entitled Telecommunications: Glossary of Telecommunication Terms is a U. Federal Standard, issued by the General Services Administration pursuant to the Federal Property and Administrative Services Act of 1949, as amended. This docu.