Coding Steganography

• USED_PIXELS = [];
• SALT = generateSalt();
• SECRETKEY = getKeyFromPassword(pw,SALT);
• STRING_BYTES = compressString(text);
• ENCRYPTED_BYTES = byteEncyption(STRING_BYTES,SECRETKEY);
• PAYLOAD = [];
• PAYLOAD_DATA = [PAYLOAD];
• BUFFER = [PAYLOAD_DATA];
• BINARY = bytesToBinary(BUFFER);
• SEED = generateSeed(pw);
• RANDOM(SEED);
• STRING_INDEX = 0;


• for STRING_INDEX to BINARY.length:

• x = RANDOM, y = RANDOM;
• PAYLOAD.append(SALT);
• PAYLOAD.append(ENCRYPTED_BYTES);


• if not contain USED_PIXELS(x,y):
1. USED_PIXELS.append(x,y);
2. pixel = image.getRGB(x,y);
3. red = EXTRACT THE BITWISE(pixel, 16)
4. green = EXTRACT THE BITWISE(pixel, 8)
5. blue = EXTRACT THE BITWISE(pixel)
6. while STRING_INDEX less than BINARY.length:
   • setLeastSignificantBit(red, STRING_INDEX++);
   • setLeastSignificantBit(green, STRING_INDEX++);
   • setLeastSignificantBit(blue, STRING_INDEX++);
7. newPixel = (red,green,blue)
8. image = (x,y,newPixel)

RETURN image;

• USED_PIXELS = [];
• AES_KEY = generateAESKey();
• SECRETKEY = getAESKeyFromBytes(AES_KEY);
• IV = bytes [16]
• COMPRESS_STRING = compressString(text);
• ENCRYPTED_DATA = encryptionAES(COMPRESS_STRING,SECRETKEY,IV);
• ENCRYPTED_RSA = getAESKeyWithRSA(AES_KEY,publicKey);
• PAYLOAD = [];
• PAYLOAD_DATA = [PAYLOAD];
• BUFFER = [PAYLOAD_DATA];
• BINARY = bytesToBinary(BUFFER);
• SEED = generateSeed(privateKey);
• RANDOM(SEED);
• STRING_INDEX = 0;


• PAYLOAD.append(ENCRYPTED_RSA);
• PAYLOAD.append(IV);
• PAYLOAD.append(ENCRYPTED_DATA);


• for STRING_INDEX to BINARY.length:
  • x = RANDOM, y = RANDOM;
  • if not contain USED_PIXELS(x,y):
    1. USED_PIXELS.append(x,y);
    2. pixel = image.getRGB(x,y);
    3. red = EXTRACT THE BITWISE(pixel, 16)
    4. green = EXTRACT THE BITWISE(pixel, 8)
    5. blue = EXTRACT THE BITWISE(pixel)
    6. while STRING_INDEX less than BINARY.length:
       • setLeastSignificantBit(red, STRING_INDEX++);
       • setLeastSignificantBit(green, STRING_INDEX++);
       • setLeastSignificantBit(blue, STRING_INDEX++);
    7. newPixel = (red,green,blue)
    8. image = (x,y,newPixel)

RETURN image;

• USED_PIXELS = [];
• ENCRYPTED_BINARY = STRING;
• ENCRYPTED_TEXT = STRING;
• SEED = generateSeed(pw)
• RANDOM = (SEED);
• START = key_word;
• END = key_word;
• DECOMPRESS_STR = STRING


• while ENCRYPTED_TEXT does not contain END:
  • x = RANDOM, y = RANDOM;
  • if not contain USED_PIXELS(x,y):
    1. USED_PIXES(x,y);
    2. pixel = image.getRGB(x,y);
    3. red = EXTRACT THE BITWISE(pixel, 16)
    4. green = EXTRACT THE BITWISE(pixel, 8)
    5. blue = EXTRACT THE BITWISE(pixel)
    6. ENCRYPTED_BINARY.append(red)
    7. ENCRYPTED_BINARY.append(green)
    8. ENCRYPTED_BINARY.append(blue)
    9. if ENCRYPTED_BINARY.length equal to or above 8:
       • EIGHT_BITS = ENCRYPTED_BINARY.substring(0,8)
       • ENCRYPTED_TEXT += EIGHT_BITS
       • ENCRYPTED_BINARY.remove(0,8)
       • if ENCRYPTED_TEXT.endsWith(END) break;
    10. if ENCRYPTED_TEXT start with START and ends with END:
        • startIndex = INTEGER(START)
        • endIndex = INTEGER(END)
        
        
        • BINARY = textToBinary(ENCRYPTED_TEXT)
        • BYTES = binaryToBytes(BINARY)
        • PAYLOAD_LENGTH = BYTES.length
        • PAYLOAD = [BYTES + PAYLOAD_LENGTH]
        
        
        • INPUT_STREAM = PAYLOAD
        • SALT = input.readBytes()
        • ENCRYPTED_DATA = input.readBytes()
        • SECRET_KEY = getKeyFromPasswor(pw,salt)
        • DECRYPTED_BYTES = byteDecryption(ENCRYPTED_DATA, SECRET_KEY)
        • DECOMPRESS_STR = decompressBytes(DECRYPTED_BYTES)
        • if DECOMPRESS_STR equals null RETURN "Decoding Failed";

RETURN DECOMPRESS_STR;

• USED_PIXELS = [];
• ENCRYPTED_BINARY = STRING;
• ENCRYPTED_TEXT = STRING;
• SEED = generateSeed(privateKey)
• RANDOM = (SEED);
• START = key_word;
• END = key_word;
• DECOMPRESS_STR = STRING


• while does not contain END:

• x = RANDOM, y = RANDOM;
• if not contain USED_PIXELS(x,y):
  1. USED_PIXELS(x,y);
  2. pixel = image.getRGB(x,y);
  3. red = EXTRACT THE BITWISE(pixel, 16)
  4. green = EXTRACT THE BITWISE(pixel, 8)
  5. blue = EXTRACT THE BITWISE(pixel)
  6. ENCRYPTED_BINARY.append(red)
  7. ENCRYPTED_BINARY.append(green)
  8. ENCRYPTED_BINARY.append(blue)
  
  
  9. if ENCRYPTED_BINARY.length equal to or above 8:
     • EIGHT_BITS = ENCRYPTED_BINARY.substring(0,8)
     • ENCRYPTED_TEXT += EIGHT_BITS
     • ENCRYPTED_BINARY.remove(0,8)
     • if ENCRYPTED_TEXT.endsWith(END) break;
  10. if ENCRYPTED_TEXT start with START and ends with END:
      • startIndex = INTEGER(START)
      • endIndex = INTEGER(END)
      
      
      • BINARY = textToBinary(ENCRYPTED_TEXT)
      • BYTES = binaryToBytes(BINARY)
      • PAYLOAD_LENGTH = BYTES.length
      • PAYLOAD = [BYTES + PAYLOAD_LENGTH]
      
      
      • INPUT_STREAM = PAYLOAD
      • RSA_KEY = input.readBytes()
      • IV = input.readBytes()
      • ENCRYPTED_DATA = input.readBytes()
      
      
      • AES_BYTES = decryptAESKEYFromRSA(RSA_KEY, privateKey)
      • SECRET_KEY = getAESFromBytes(AES_BYTES)
      • DECRYPTED_BYTES = decryptAES(ENCRYPTED_DATA, SECRET_KEY, IV)
      • DECOMPRESS_STR = decompressBytes(DECRYPTED_BYTES)
      • if DECOMPRESS_STR equals null RETURN "Decoding Failed";

RETURN DECOMPRESS_STR;