This Alphabet Cipher involves alphabet substitution using a keyword.
Lewis Carroll Books
The Alphabet Cipher
Lewis Carroll (1832–1896), mainly known as a writer, was also a mathematician. Among his lesser-known works, there's a brief article, probably published in a children's magazine, in which he presented a cryptographic cipher. The article is titled "The Alphabet Cipher" and is dated 1868.
When Alice falls down a rabbit hole, nothing could prepare her for the adventure that awaits her on the other side. One minute she’s too big, the next she’s too small, and she has no idea where she is or how she can get home.
The Making of Lewis Carroll′s Alice and the Invention of Wonderland
'Alice’s Adventures in Wonderland' and 'Through the Looking-Glass' are two of the most famous, translated and quoted books in the world. But how did a casual tale told by Charles Dodgson (aka Lewis Carroll), an eccentric Oxford mathematician, to Alice Liddell, daughter of the Dean of Christ Church, grow into such a phenomenon?