🏛️ スキュタレー暗号デコーダー＆ソルバー

def scytale_encrypt(text, turns): """ Encrypt plaintext using Scytale cipher Args: text (str): Message to encrypt turns (int): Number of turns (rod diameter/rows) Returns: str: Encrypted ciphertext """ # Calculate columns needed columns = len(text) // turns + (len(text) % turns > 0) # Build grid row by row grid = [] for i in range(turns): row = [] for j in range(columns): index = i * columns + j row.append(text[index] if index < len(text) else '') grid.append(row) # Read column by column to create ciphertext result = '' for col in range(columns): for row in range(turns): if grid[row][col]: result += grid[row][col] return result def scytale_decrypt(text, turns): """ Decrypt ciphertext using Scytale cipher Args: text (str): Ciphertext to decrypt turns (int): Number of turns (rod diameter/rows) Returns: str: Decrypted plaintext """ # Calculate grid dimensions columns = len(text) // turns + (len(text) % turns > 0) grid = [['' for _ in range(columns)] for _ in range(turns)] # Fill grid column by column text_index = 0 for col in range(columns): for row in range(turns): if text_index < len(text): grid[row][col] = text[text_index] text_index += 1 # Read row by row to get plaintext result = '' for row in grid: result += ''.join(row) return result def scytale_brute_force(ciphertext): """Brute force attack - try all possible rod diameters""" results = [] for turns in range(2, len(ciphertext)): decrypted = scytale_decrypt(ciphertext, turns) results.append({'turns': turns, 'text': decrypted}) return results # Example usage plaintext = "ATTACKATDAWN" turns = 3 # Encryption ciphertext = scytale_encrypt(plaintext, turns) print(f"Plaintext: {plaintext}") print(f"Ciphertext: {ciphertext}") # Output: AATWCTATKDAN # Decryption decrypted = scytale_decrypt(ciphertext, turns) print(f"Decrypted: {decrypted}") # Output: ATTACKATDAWN # Brute force attack results = scytale_brute_force(ciphertext) for result in results[:5]: # Show first 5 results print(f"Turns {result['turns']}: {result['text']}")