I am looking for different ciphers that use a key word (like "hello" or "awesome") to encrypt a given text. I know about the Keyword Cipher already; I'm looking for others.

  • $\begingroup$ Related (possible duplicate?): crypto.stackexchange.com/questions/3826/… $\endgroup$ – Ilmari Karonen May 31 '19 at 22:48
  • $\begingroup$ Can you clarify if you are looking for pencil-and-paper ciphers or if this is a more general question? A string can always be hashed to a fixed-length bit vector, that can be used as a key for any block or stream cipher. $\endgroup$ – Frank Denis May 31 '19 at 23:31
  • $\begingroup$ This is more general, @FrankDenis. It can be pencil-and-paper but I liked that second idea. Can you tell me more? $\endgroup$ – DUO Labs Jun 1 '19 at 1:07
  • $\begingroup$ Note that modern ciphers require a key rather than a keyword / password. Hence you'd first pass the password through a Password Based Key Derivation Function (PBKDF) to stretch the key - i.e. make it harder to guess the password. Afterwards any secure cipher will do. $\endgroup$ – Maarten Bodewes Jun 3 '19 at 9:34
  • $\begingroup$ @MaartenBodewes How do you do that? $\endgroup$ – DUO Labs Jun 3 '19 at 17:06

Try looking at the Vigenere, or here is a complete list of keyword ciphers: All the ciphers listed here are based on keys, but could be a little difficult to use. Some include making the keyword into a numerical sequence. By numbering each letter according to their place in the alphabet. If a letter appears twice, number them left to right.

i.e. CAESAR = 314526

  • $\begingroup$ Sorry, here is the link: $\endgroup$ – Neo1009 Jun 1 '19 at 20:19
  • $\begingroup$ cryptogram.org/resource-area/cipher-types $\endgroup$ – Neo1009 Jun 1 '19 at 20:19
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    $\begingroup$ Tip: You can use the "edit" link beneath your answer to make changes to it $\endgroup$ – Ella Rose Jun 1 '19 at 20:47
  • $\begingroup$ Thank you! @Neo1009 $\endgroup$ – DUO Labs Jun 1 '19 at 23:47

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