Computer Information Systems

Step 1: Python Code: def letter_to_number(letter): return ord(letter) - ord('A') def number_to_letter(number): return chr(number + ord('A')) def encrypt_message(message): encrypted_message = "" for letter in message: if letter.isalpha(): # Only encrypt alphabetic characters number = letter_to_number(letter) encrypted_number = (-7 * number + 1) % 26 encrypted_letter = number_to_letter(encrypted_number) encrypted_message += encrypted_letter else: encrypted_message += letter # Keep non-alphabetic characters as they are return encrypted_message message = "WATCH YOUR STEP" encrypted_message = encrypt_message(message) print(f"Original Message: {message}") print(f"Encrypted Message: {encrypted_message}") Explanation: This Python code is designed to encrypt a given message using a specific mathematical function. The process involves three main functions: letter_to_number , number_to_letter , and encrypt_message . The letter_to_number function converts each letter to its corresponding position in the alphabet (e.g., A = 0, B = 1). The number_to_letter function reverses this process, converting a numerical position back to its corresponding letter. The encrypt_message function applies the encryption function f ( p ) = ( − 7 p + 1 ) m o d 26 f(p) = (-7p + 1) \mod 26 f ( p ) = ( − 7 p + 1 ) mod 26 to each letter in the message, transforming it into a new letter. This function also ensures that only alphabetic characters are encrypted, leaving spaces and punctuation unchanged. The final result is an encrypted message that is printed alongside the original input. For example, the message "WATCH YOUR STEP" is encrypted to "DBYNE PHRM FYZA". Step 2: Output of above code: Original Message: WATCH YOUR STEP Encrypted Message: DBYNE PHRM FYZA === Code Execution Successful === <img src="data:image/png;base64,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

Computer science

Encrypt the message WATCH YOUR STEP by translating the letters into numbers, applying the given encryption function, then translating the numbers back into letters - a. f(p) = (-7p + 1)\r\nmod 26

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Computer science

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