I HAVE A SUBJECT NAMED INS(INFORMATION AND NETWORK SECURITY)
IN THIS SUBJECT WE LEARN ABOUT SECURITY OF NETWORKS AND INFORMATION AS THE NAME SUGGESTS.
WHAT I AM LEARNING TODAY IS MONO-ALPHABETIC CIPHER(ENCODING STUFF SO NO ONE CAN UNDERSTAND IT OTHER THAN THE PEOPLE WHO SHOULD UNDERSTAND IT).
This cipher is of the type called "Substitution".
That means that it will substitute the words in the original text with some other text and encrypted message will be form.
Things to note down :-
- Plain Text:- This is the text that needs to be encrypted(the stuff which no one can read).
- Cipher Text:- This is the text we get after we encrypt the Plain Text.
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Now back to the topic.
What is Monoalphabetic Cipher?
A monoalphabetic substitution cipher, also known as a simple substitution cipher, relies on a fixed replacement structure. That is, the substitution is fixed for each letter of the alphabet. Thus, if "a" is encrypted to "R", then every time we see the letter "a" in the plaintext, we replace it with the letter "R" in the ciphertext.
Source of the above definition is:- This_Site
Lets take an example,
Plain Text :- "Hey Follow me"
Monoalphabetic Cipher Text :- "Ifz Gpmmpx nf"
I hope you have guessed what I have done. It's simple right. That's why this cipher is known an the simplest Substitution Cipher.
For those who are still living in a parallel world, here I have replaced each character with the next character coming in the alphabetic sequence i.e H replaced by I.
IMP NOTE :-
This is not the only way you can do ciphering, you can skip two characters or develop a logic that you like but the letter you substitute must be in alphabetic if the Plain text is alphabetic. Similarly if the Plain text is numeric or special character then the Cipher Text Should also be numeric or special character respectively.
Well that's all about this.
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