Himel-Sarder / Caesar-Cipher--Text-encoder-decoder

Caesar cipher is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher where each letter in the plaintext is shifted a certain number of places down or up the alphabet.

Caesar-Cipher--Text-encoder-decoder

ScreenShots

Title Bar Encoding Decoding

What is Caesar Cipher?

Caesar cipher is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher where each letter in the plaintext is shifted a certain number of places down or up the alphabet.

For example, with a shift of 3:
A becomes D
B becomes E
C becomes F
...
X becomes A
Y becomes B
Z becomes C

More : https://en.wikipedia.org/wiki/Caesar_cipher

Try in Replit

https://replit.com/@AntuSarder/Caesar-Cipher-A-text-encoder-and-decoder?v=1#main.py

Take a look

Caesar.Cipher.mp4

Features

• Encrypt text using a specified shift value
• Decrypt text using the same shift value
• Support for both uppercase and lowercase letters
• Command-line interface for easy usage

Installation

To install the Caesar Cipher program, follow these steps:

1. Clone the repository: git clone https://github.com/Himel-Sarder/Caesar-Cipher--Text-encoder-decoder.git
2. Navigate to the project directory: cd caesar cipher

Usage

To use the Caesar Cipher program, run the following command:

python caesar cipher.py

Follow the prompts to enter the text to encrypt or decrypt, the shift value, and the desired operation (encode or decode).

Examples

Suppose we have the plaintext message "HELLO" and we want to encrypt it using a Caesar Cipher with a shift value of 3:
Determine the shift value: In this case, it's 3.
Map each letter of the plaintext to its corresponding letter after shifting by 3:
'H' becomes 'K'
'E' becomes 'H'
'L' becomes 'O'
'L' becomes 'O'
'O' becomes 'R'
Combine the shifted letters to form the encrypted message: "KHOOH".
So, the encrypted message for "HELLO" using a Caesar Cipher with a shift value of 3 is "KHOOH".

License

This project is licensed under the MIT License. See the LICENSE file for details.

Author

• Himel Sarder
• Dept. of CSE, BSFMSTU, Bangladesh

Required knowledge

• Loops
• If/else conditons
• Python function
• Module
• ASCII art

FAQ

Q: What is the maximum shift value supported by the Caesar Cipher program?
A: The maximum shift value is 25, which corresponds to shifting the entire alphabet by one position.

Q: Can I use negative shift values to encrypt text in reverse?
A: Yes, negative shift values can be used to encrypt text in reverse order, but decryption will require a positive shift value.

Online caesar cipher for better experience

https://www.boxentriq.com/code-breaking/caesar-cipher

Conclusion

Thank you for using the Caesar Cipher program! We hope you find it useful for encrypting and decrypting your messages securely.

Thank You