Output:
What is Ceasar Cipher?
The Caesar cipher, also known as the Caesar shift or Caesar's code, is a simple and ancient encryption technique. It is a substitution cipher where each letter in the plaintext is shifted a certain number of places down or up the alphabet. The method is named after Julius Caesar, who is historically famous for using it to communicate with his generals.
Example
Here's how the Caesar cipher works:
- Choose a shift value (key). This is typically a positive integer.
- Shift each letter in the plaintext by the chosen value.
- Wrap around to the beginning of the alphabet if necessary (e.g., shifting "z" by 1 results in "a").
- Leave non-alphabetic characters unchanged.
For example, with a shift of 3:
- Plain: 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
- Cipher: 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
So, using a Caesar cipher with a shift of 3, the word "HELLO" would be encrypted as "KHOOR."
It's important to note that the Caesar cipher is not secure for serious cryptographic use because there are only 25 possible keys (assuming a standard English alphabet). This makes it vulnerable to brute force attacks, where an attacker could try all possible shifts until finding the correct one.