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Basic Substitution Cipher
 
Cryptology 101 - Part 5
Back to the Ancient Substitution Cipher: The Caesarian Shift -->

What Julius Caesar did with the invention of the Caesarian Shift established the foundations of cryptology. From that point onward all cryptology has evolved from the basic principle of substituting one letter for another. This is called creating a Substitution Cipher.

The next step in the evolution of Caeser's substitution cipher was the use of a keyword. Caeser created a cipher alphabet by shifting the alphabet by a previously agreed upon number.

For example an alphabet shifted by one letter would start with B and end with A. Shifting by two would result in the alphabet beginning with C and ending with B. Shifting three would cause the cipher alphabet to start with D and end with C, etc.

The weakness of the Caesarian Shift is that there are only 26 possible cipher alphabets. Given enough time anyone can decipher a ciphertext that is encrypted using a Caesarian Shift.

To create more secure and unique cipher alphabets a keyword is used when implementing the shift. The result is an easy to use secure cipher that can only be deciphered if you know the keyword. This type of substitution shift is called a monoalphabetic cipher because it makes use of a single fixed substitution alphabet. Later on we will look at polyalphabetic ciphers which use multiple alphabets.

So lets get started on using a simple monoalphabetic cipher.

Learn to Write a Monoalphabetic Cipher -->


 
 



 

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Pop Culture Madness is your one-stop information location for Popular Culture, Popular Music, Trivia, Jokes and a bunch of other stuff! We update our Pop Culture News daily and our Pop Music section has hundreds of pages featuring the best and worst songs of all time. Our aim is to maintain a family-friendly, "PG" site. We have no swearing and no gory stuff, although some humor may need a creative explanation for younger visitors.

Our motto: "All The Pop Culture News That Fits, We Print!" We are adding more information daily. Well, semi-regularly. If you don't see a link for what you're looking for, then it's your responsibility to write something up, and send it in. WE NEED WRITERS!!!

By the way, PCM does NOT allow sneaky spyware. Nor do we link to sites that have excessive Pop-ups, spyware or inappropriate (all ages) material. If you find one, please let us know and they are toast!
Also, since we're too proud (so far) to ask for donations, we'd like to proudly point out some of our carefully chosen advertisers throughout the site. They have some cool stuff that should be sitting in your room, or wrapped like a present for a friend.
Please check 'em out!

  
 

 

All logos and pictures are copyright of the individual creators, teams and owners. All rights are reserved for them. We don't pretend or assume that we have anything to do with any professional, semi-professional, or entertainment sports or publishing organizations. This e-zine website's purpose is news, information,opinion, trivia, statistical information, and retail representation of product. If you see a CD, DVD or other "new item," you can probably click on it to but from Amazon or one of our other fine affiliates or advertisers! If you feel that we are unfairly infringing on any of your "intellectual property", and want us to take down any pictures or copyright material on this site, we will gladly work with you to stop any problem.
If we think you are out of line, we will tell the world that you're a big jerk, or words to that effect.
We do not condone illegal downloads, reprinting uncredited or unauthorized works or derivitives.
Everything else Copyright © 1999-2009 Pop Culture Madness.com.
If we made an error, we will do whatever is reasonable to fix it. Otherwise, we're all friends, right?
 
Advertise on PopCultureMadness ~ Contact Us ~ Blog ~ MySpace
  
Privacy Statement: We will not sell, give or share any personal information, including e-mail addresses, of any of our visitors to anyone outside of Pop Culture Madness.com or our affiliated sites. We do not accept any stealth or spyware advertisers or third party sponsors of such programs. Pop Culture Madness.com and affiliated sites do not send spam, offer get-rich-quick schemes, offer or suggest "enhancement" devices or medications via e-mail.
PCM does use third-party advertising companies, such as google, to serve ads when you visit our website. These companies may use information (not including your name, address, email address, or telephone number) about your visits to this and other websites in order to provide advertisements about goods and services of interest to you. If you would like more information about this practice and to know your choices about not having this information used by these companies, click here.