In classical cryptography, the running key cipher is a type of polyalphabetic substitution cipher in which a text, typically from a book, is used to provide a very long keystream. Usually, the book to be used would be agreed ahead of time, while the passage to use would be chosen randomly for each message and secretly indicated somewhere in the message.
Read more about Running Key Cipher: Example, Variants, Security, Confusion
Famous quotes containing the words running, key and/or cipher:
“Tattoo-shops, consulates, grim head-scarfed wives;
And out beyond its mortgaged half-built edges
Fast-shadowed wheat-fields, running high as hedges,
Isolate villages, where removed lives
Loneliness clarifies. Here silence stands
Like heat. Here leaves unnoticed thicken,
Hidden weeds flower....”
—Philip Larkin (1922–1986)
“This is not a book. This is libel, slander, defamation of character. This is not a book, in the ordinary sense of the word. No, this is a prolonged insult, a gob of spit in the face of Art, a kick in the pants to God, Man, Destiny, Time, Love, Beauty ... what you will. I am going to sing for you, a little off key perhaps, but I will sing.”
—Henry Miller (1891–1980)
“The eye is the first circle; the horizon which it forms is the second; and throughout nature this primary figure is repeated without end. It is the highest emblem in the cipher of the world.”
—Ralph Waldo Emerson (1803–1882)