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:
“I think that carrying a baby inside of you is like running as fast as you can. It feels like finally letting go and filling yourself up to the widest limits.”
—Anonymous Mother. Ourselves and Our Children, by Boston Women’s Health Book Collective, ch. 2 (1978)
“You have many choices. You can choose forgiveness over revenge, joy over despair. You can choose action over apathy.... You hold the key to how well you make the emotional adjustment to your divorce and consequently how well your children will adapt.”
—Stephanie Marston (20th century)
“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)