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我正在编写一个加密图像中的文本的隐写术系统 - 我决定在将文本嵌入图片之前也要对其进行加密。隐写算法适用于字符串输入/输出。

由于我的心血来潮,我一直在尝试使用 DES 和 AES 算法,但遇到了上面的异常。我将展示例如 AES 算法的加密/解密方法:

    public static byte[] encryptText(String plainText,SecretKey secKey) throws Exception{
    // AES defaults to AES/ECB/PKCS5Padding in Java 7
    Cipher aesCipher = Cipher.getInstance("AES");
    aesCipher.init(Cipher.ENCRYPT_MODE, secKey);
    byte[] byteCipherText = aesCipher.doFinal(plainText.getBytes());
    return byteCipherText;}


    public static String decryptText(byte[] byteCipherText, SecretKey secKey) throws Exception {
    // AES defaults to AES/ECB/PKCS5Padding in Java 7
    Cipher aesCipher = Cipher.getInstance("AES");
    aesCipher.init(Cipher.DECRYPT_MODE, secKey);
    byte[] bytePlainText = aesCipher.doFinal(byteCipherText);
    return new String(bytePlainText);
}

这是调用(加密方面):

  //sending the text to encrypt using AES algorithm
byte[] cipherText = new AES_Algorithm().encrypt(messageDesc.getText(), key);
  //converting into a String to encrypt using Steganography
newStringtoEncrypt = new String (cipherText);

这是调用(解密方面)-例外

  //AES encrypted String after the Steganography's decryption 
String decMessage = dec.decode(path, name);
  //converting the String to byte []
byte [] byteArray = decMessage.getBytes();
try{
    //HERE IS WHERE I GET THE EXCEPTION
    //sending the byte array to decryption
  String original = AES_Algorithm().decrypt(byteArray, key);

哪里有问题?

密钥是相似的,字节数组也是相似的(我通过打印序列来检查它) - 但我被告知我不能使用getBytes()以便从字符串转换为byteArray我打算使用AES/DES解密算法的时间。

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1 回答 1

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加密的输出是二进制的,您不能String像在此代码中那样将其转换为:

byte[] cipherText = new AES_Algorithm().encrypt(messageDesc.getText(), key);
//converting into a String to encrypt using Steganography
newStringtoEncrypt = new String (cipherText);

如果您需要加密数据 as String,则需要以某种方式对其进行编码,例如通过base64encoding或通过hexEncoding

于 2016-05-26T10:11:12.667 回答