Abstract
The autokey cipher, suggested by Vigenère himself as an improvement on the cipher that now carries his name, is similar to the Vigenère cipher in that it is polyalphabetic: it uses different shift amounts for different letters. However, it is stronger, in that it cannot be attacked in the same way as the Vigenère cipher can. Let us see how it works.
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Rubinstein-Salzedo, S. (2018). Other Types of Ciphers. In: Cryptography. Springer Undergraduate Mathematics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-94818-8_7
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DOI: https://doi.org/10.1007/978-3-319-94818-8_7
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