function start() var originalText = "Hello World"; var encoded = encode(originalText); var decoded = decode(encoded); println("Original: " + originalText); println("Encoded: " + encoded); println("Decoded: " + decoded); // Transform the clear text into cipher text function encode(text) var result = ""; for (var i = 0; i < text.length; i++) // Shift character code forward by 5 positions var newCode = text.charCodeAt(i) + 5; result += String.fromCharCode(newCode); return result; // Reverse the cipher text back to clear text function decode(text) var result = ""; for (var i = 0; i < text.length; i++) // Shift character code backward by 5 positions var originalCode = text.charCodeAt(i) - 5; result += String.fromCharCode(originalCode); return result; Use code with caution. Python Implementation Strategy
text. If they sent "HELLO," the drone would intercept it immediately. To stay hidden, Bo proposed a custom encoding scheme 83 8 create your own encoding codehs answers exclusive
# 8.3.8 Create Your Own Encoding - CodeHS Exclusive Solution # Step 1: Define the custom encoding dictionary ENCODING_MAP = 'A': '0000', 'B': '0001', 'C': '0010', 'D': '0011', 'E': '0100', 'H': '0101', 'L': '0110', 'O': '0111', 'R': '1000', 'W': '1001', ' ': '1111' # Step 2: Create a reverse lookup dictionary for decoding DECODING_MAP = v: k for k, v in ENCODING_MAP.items() def encode_message(message): """Converts plain text into the custom binary string.""" binary_output = "" # Convert message to uppercase to match our map keys formatted_message = message.upper() for char in formatted_message: if char in ENCODING_MAP: binary_output += ENCODING_MAP[char] else: # Fallback for unsupported characters print(char + " is not supported in this custom encoding.") return binary_output def decode_message(binary_string): """Converts the custom binary string back into plain text.""" text_output = "" # Read the binary string in chunks of 4 bits chunk_size = 4 for i in range(0, len(binary_string), chunk_size): bit_chunk = binary_string[i:i+chunk_size] if bit_chunk in DECODING_MAP: text_output += DECODING_MAP[bit_chunk] else: text_output += "?" # Unknown chunk flag return text_output # Step 3: Test the implementation def main(): original_text = "HELLO WORLD" print("Original Text: " + original_text) # Run the encoder encoded = encode_message(original_text) print("Encoded Binary: " + encoded) # Run the decoder decoded = decode_message(encoded) print("Decoded Text: " + decoded) if __name__ == "__main__": main() Use code with caution. Step-by-Step Code Breakdown function start() var originalText = "Hello World"; var