Brain Teasers
Brain Teasers Trivia Mentalrobics Games Community
Monoalphabetic
Caesar
Atbash
Keyword
Pigpen / Masonic
Polybius Square
Polyalphabetic
Vigenère
Beaufort
Autokey
Running Key
Polygraphic
Playfair
Bifid
Trifid
Four-square
Transposition
Rail Fence
Route
Columnar Transposition
Others
Book
Beale
Morse Code
Tap Code
One-time Pad
Scytale
Semaphore
ASCII
Steganography
Add to Google Add to del.icio.us

More ways to get Braingle...

Codes and Ciphers :: Running Key Cipher

To encrypt a plaintext message using the Vigenère Cipher, one locates the row with the first letter to be encrypted, and the column with the first letter of the keyword. The ciphertext letter is located at the intersection of the row and column. This continues for the entire length of the message.

In a Running Key cipher, the keyword is the text of a predetermined book or passage. For example, if the chossed book was "A Tale of Two Cities" by Charles Dickens, then the keyword would be

It was the best of times, it was the worst of times...

Enciphering and deciphering the message is performed using the exact same method as the Vigenère Cipher.

If the predetermined passage is a string of random letters that is only used once and then discarded, this is similar to a One-time Pad.

Running key code chart


Table of Contents
Books about Cryptography

   



Users in Chat : sciencesteven 

Online Now: 20 users and 439 guests

Copyright © 1999-2014 | Updates | FAQ | RSS | Widgets | Links | Green | Subscribe | Contact | Privacy | Conditions | Advertise

Custom Search





Sign In A Create a free account