Скачать или смотреть Caesar Cipher || Substitution Technique

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CAESAR CIPHER-Assignment:
Implement a program that encrypts and decrypts messages using the Caesar Cipher technique:
Instructions:
Write a Python program that asks the user to:
1. Enter a message (plaintext).
Enter a shift value (number of positions to shift).
Choose whether to encrypt or decrypt the message.
2. The program should:
Encrypt the message by shifting letters forward.
Decrypt the message by shifting letters backward.
3. Ensure that:
Only letters are shifted (leave spaces, numbers, and punctuation unchanged).
Both uppercase and lowercase letters are supported.


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