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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.
Learn how to encipher and decipher messages using a long key from a book or other source. Find out how to break this cipher with statistical analysis and word models.
Running Key Cipher. The Running Key cipher has the same internal workings as the Vigenère cipher. The difference lies in how the key is chosen; the Vigenère cipher uses a short key that repeats, whereas the running key cipher uses a long key such as an excerpt from a book.
The Running Key Cipher is an encryption technique within the field of cryptography, enhancing the security measures established by the simpler Vigenère cipher. It employs a long piece of text, known as the key, which is typically extracted from a book or another extensive source.
Learn how to encrypt and decrypt messages using the Vigenere cipher, a polyalphabetic encryption algorithm invented by Blaise de Vigenère. Find out how to recognize, break and solve Vigenere ciphertext with examples and tools.
The running key cipher distinguishes from other polyalphabetic substitution ciphers. Instead of a relatively short keyword, used over and over again, is uses a secret key of the same length as plaintext size.
running-key cipher. cryptology. Also known as: autokey cipher. Learn about this topic in these articles: history of Vigenère ciphers. In Vigenère cipher. Even though running-key or autokey ciphers eliminate periodicity, two methods exist to cryptanalyze them.
