Tool to decode/encode with Ragbaby cipher, an encryption system proposing a progressive and different shift for each word.
Ragbaby Cipher - dCode
Tag(s) : Poly-Alphabetic Cipher
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Ragbaby is a polyalphabetic substitution cipher using a progressive shift.
For each word, numbered i (ranging from 1 to N), each letter, numbered j (ranging from 0 to M) is shifted by i+j in the alphabet.
Example: Encrypt the 2 words RAG BABY with the alphabet ALPHBETCDFGIKMNOQRSUVWYZ, to obtain SPM THDH
The alphabet is generated from a keyword, whose repeated letters are removed before adding the rest of the letters of the alphabet in order.
Example: SECRET generates SECRTABDFGHIJKLMNOPQUVWXYZ
In the original version, the author describes an alphabet of only 24 letters, by removing the J (replaced by I) and the X (replaced by W).
Ragbaby necessarily has spaces (or other limiter) to separate the words.
In the original version, only 24 letters are used (no J or X).
The alphabet and its size are configurable.
The first word is shifted by 1, it is possible to take another value.
Each letter induces an additional shift of 1, it is possible to shift more.
Ragbaby was proposed by Sherlac, a member of the ACA (American Cryptogram Association) in 1955.
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Cite as source (bibliography):
Ragbaby Cipher on dCode.fr [online website], retrieved on 2023-09-27,