Caesar Cipher


Caesar Cipher Encrypt and Decrypt

Encrypt or Decrypt Caesar Cipher. Support brute force mode (all possibilities).

What is Caesar Cipher ?

The Caesar cipher is one of the oldest cipher or encryption, founded by of course as the name implies, Julius Caesar. It is a type of substitution cipher in which each letter in the plaintext is 'shifted' . For example, with a shift of 1, H would be replaced by I, Z would become A, and so on.

The best way to imagining how this cipher works is by imagining circle with 26 character sorted alphabetically, From A-Z, and after Z, it is A.

The other way to imagine this cipher is with a long list of character that repeating the same set of character such as A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A B C D E F G ...

For better understanding this cipher, you just need to imagine the alphabet can be numbered. Such as A is 1, B is 2, C is 3, D is 4, Z is 26, and continuing with other characters.

note: the shift can go both ways such as up(left) or down(right)

Algorithmic side

If there's a tricky question: I have encrypted text knud that is shifted by 14431.

How to get the answer? do we need to shift 14431 times? it would be a tremendous work. So, we can try to use modulo operator on math. So, 14431 mod 26 is 1. That's the answer, shift by 1. So if we shift up knud with 1 character, it would become love. Question solved


Good things inside ?

Encrypted in caesar cipher shifted with 7 :

Nvvk aopunz puzpkl ?


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