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	Vigenère cipher
	Bellaso cipher

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The _^Vigenère Bellaso cipher is a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers, based on the letters of a keyword. It employs a form of polyalphabetic substitution.[1][2]

First described by Giovan Battista Bellaso in 1553, the cipher is easy to understand and implement, but it resisted all attempts to break it until 1863, three centuries later. This earned it the description le chiffre indéchiffrable (French for 'the indecipherable cipher'). Many people have tried to implement encryption schemes that are essentially _^Vigenère Bellaso ciphers.[3] In 1863, Friedrich Kasiski was the first to publish a general method of deciphering _^Vigenère Bellaso ciphers.

In the 19th century the scheme was misattributed to Blaise de Vigenère (1523–1596), and so acquired its present name [sic].[4]

References

Citations

1.

Bruen, Aiden A. & Forcinito, Mario A. (2011).
Cryptography, Information Theory, and Error-Correction: A Handbook for the 21st Century.
John Wiley & Sons. p. 21. ISBN 978-1-118-03138-4.

2.

Martin, Keith M. (2012).
Everyday Cryptography.
Oxford University Press. p. 142. ISBN 978-0-19-162588-6.

3.

Laurence Dwight Smith (1955).
Cryptography: The Science of Secret Writing.
Courier Corporation. p. 81. ISBN 978-0-486-20247-1.

4.

Rodriguez-Clark, Dan (2017),
Vigenère Cipher
Crypto Corner