Isn't Caesar cipher a monoalphabetic cipher?

  • Context: Comp Sci 
  • Thread starter Thread starter shivajikobardan
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Discussion Overview

The discussion revolves around the classification of the Caesar cipher as a monoalphabetic cipher and the implications of teaching it in relation to other types of ciphers, particularly monoalphabetic and homophonic ciphers. Participants explore the characteristics of these ciphers and their relative complexities in terms of solving them.

Discussion Character

  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants assert that the Caesar cipher is indeed a monoalphabetic substitution cipher, noting its simplicity and the fact that the order of the alphabet remains unchanged.
  • Others argue that teaching the Caesar cipher before introducing monoalphabetic ciphers is misleading, as it suggests that monoalphabetic ciphers address problems specific to the Caesar cipher, which they believe is incorrect.
  • A participant points out that while the Caesar cipher is easy to solve through frequency analysis, less trivial monoalphabetic ciphers present more challenges.
  • One participant illustrates the ease of solving a Caesar cipher compared to a monoalphabetic cipher, emphasizing that the latter can be significantly harder to decode with limited data.

Areas of Agreement / Disagreement

Participants express differing views on the classification of the Caesar cipher and the appropriateness of teaching it in relation to other ciphers. There is no consensus on whether monoalphabetic ciphers effectively address the issues presented by the Caesar cipher.

Contextual Notes

Some claims depend on the definitions of monoalphabetic and homophonic ciphers, and the discussion highlights the varying levels of complexity involved in solving different types of ciphers.

shivajikobardan
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Homework Statement
Caeser cipher, monoalphabetic cipher
Relevant Equations
Cipher=(Plain+k)%26, Plain=(Cipher-k)%26
I feel so, but some are teaching ceaser cipher before monoalphabetic cipher and telling "there are problems of ceaser cipher" that were solved by "monoalphabetic cipher". It sound wrong. While homophonic cipher could've solved ceaser cipher's problem. But telling monoalphabetic cipher solves ceaser cipher problem is wrong sounding. What do you think?
 
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The Caesar cipher is a monoalphabetic substitution.
The simple substitution is the same throughout the message.
The order of the alphabet is not changed, which makes it trivial to solve.
 
shivajikobardan said:
I feel so, but some are teaching ceaser cipher before monoalphabetic cipher and telling "there are problems of ceaser cipher" that were solved by "monoalphabetic cipher". It sound wrong. While homophonic cipher could've solved ceaser cipher's problem. But telling monoalphabetic cipher solves ceaser cipher problem is wrong sounding. What do you think?
The Caesar cipher is a special case of a monoalphabetic cipher. It is particularly easy to solve by frequency analysis in a way that less trivial monoalphabetic ciphers are not: can you think what that is?
 
You can solve a Caesar cipher in your head, try solving a monoalphabetical cipher in your head!
EG if head encodes to khdg, then decode jrrg erb - it's easy, there's enough data to work with, you don't even need to know that khdg means head, just trying variation after variation is enough.

But in a monoalphabetic cipher, if head encodes to qrri, decode afgdw pleo - you can't, too little data.

While monoalphabetical is relatively easy with a computer and a reasonable amount of data -a dozen sentances and you're there, usually, it has big problems when dealing with just two or three words to work with. Therefore monoalphabetic solves the simplicity of Caesar in some cases.
 

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