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This outlines the gronsfeld cipher, which is a modification of the vigenere cipher. I like and find this cipher interesting because of it using numbers instead of letters, and I like cryptography which uses numbers.

Interesting. Gronsfeld ciphers then form a subset of Vigenere ciphers. That is, there's a one-to-one correspondence between Gronsfeld ciphers and Vigenere ciphers where keywords are formed from the letters A through J.