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POJava - Decrypted string using XOR not producing original/encrypted string
 

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  1. POJava - Decrypted string using XOR not producing original/encrypted string
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    <p>I've been provided with specific steps regarding encryption which is essentially converting a string to a byte array and "XORing" each byte array element with a specific number and converting this new byte array to a string. </p> <p>As for the decryption I'm to reconvert the decrypted string into a byte array, take each element XOR this with the number used in the encryption and convert the new decrypted array to a string to give me the exact string i started with.</p> <p>Unfortunately I'm unable to do obtain the string I started with e.g. when i attempt encrypting 6,7,8,9,10 the decryption returns B@722b9406 not 6,7,8,9,10. Any ideas why this is so?</p> <p>My ENCRYPTION CODE is below:</p> <pre><code> //Take each array element and do "Exclusive or" with "50" public void XORUnencryptedByteArray() { System.out.println("\nPART 3:\nXORUnencryptedByteArray() - " + "UnencryptedStringAsByteArray.length IS: " + UnencryptedStringAsByteArray.length); byte[] UnencryptedByteArraybyXOR = new byte[UnencryptedStringAsByteArray.length]; int XOR_Value = 50; byte XOR_Value_as_byte = (byte) XOR_Value; System.out.println("\nPART 3:\nXORUnencryptedByteArray() - " + "XOR_Value_as_byte IS: " + XOR_Value_as_byte + "\n"); for ( int j = 0; j &lt; UnencryptedStringAsByteArray.length; j++ ) { System.out.println("\nPOSITION " + j + " OF UnencryptedStringAsByteArray[j] CONTAINS: " + UnencryptedStringAsByteArray[j]); System.out.println("\n" + UnencryptedStringAsByteArray[j] + " ^ " + XOR_Value_as_byte + " IS: " + (UnencryptedStringAsByteArray[j] ^ XOR_Value_as_byte)); } for (int i = 0; i &lt; UnencryptedByteArraybyXOR.length; i++) { UnencryptedByteArraybyXOR[i] = (byte) (UnencryptedStringAsByteArray[i] ^ XOR_Value_as_byte); System.out.println( "\nPOSITION " + i + " OF UnencryptedByteArraybyXOR[i] IS: " + UnencryptedByteArraybyXOR[i]); } //Collect all encrypted array elements and convert the byte array to string System.out.println("\nUnencryptedByteArraybyXOR.length IS: " + UnencryptedByteArraybyXOR.length); System.out.println("\nUnencryptedByteArraybyXOR.toString() AS STRING IS: " + UnencryptedByteArraybyXOR.toString()); UnencryptedByteArraybyXORAsString = new String(UnencryptedByteArraybyXOR); //System.out.println("\nUnencryptedByteArraybyXORAsString IS: " + UnencryptedByteArraybyXORAsString); WriteStringToFile(UnencryptedByteArraybyXOR.toString()); } public void WriteStringToFile(String UnencryptedByteArraybyXORAsString) { try { String str = UnencryptedByteArraybyXORAsString; File newTextFile = new File("/Users/anmonari/Desktop/textfile.txt"); FileWriter fw = new FileWriter(newTextFile); fw.write(str); fw.close(); } catch (IOException iox) { //do stuff with exception iox.printStackTrace(); } } </code></pre> <p>my DECRYPTION code is below:</p> <pre><code> public void XORDecryptedByteArray(byte[] encryptedStringAsByteArray) { System.out.println("\nXORencryptedByteArray() - " + "encryptedStringAsByteArray.length IS: " + encryptedStringAsByteArray.length); byte[] encryptedByteArraybyXOR = new byte[encryptedStringAsByteArray.length]; int XOR_Value = 50; byte XOR_Value_as_byte = (byte) XOR_Value; System.out.println("\nXORencryptedByteArray() - " + "XOR_Value_as_byte IS: " + XOR_Value_as_byte + "\n"); for ( int j = 0; j &lt; encryptedStringAsByteArray.length; j++ ) { System.out.println("\n" + encryptedStringAsByteArray[j] + " ^ " + XOR_Value_as_byte + " IS: " + (encryptedStringAsByteArray[j] ^ XOR_Value_as_byte)); } for (int i = 0; i &lt; encryptedByteArraybyXOR.length; i++) { encryptedByteArraybyXOR[i] = (byte) (encryptedStringAsByteArray[i] ^ XOR_Value_as_byte); System.out.println("\n" + "POSITION " + i + " OF encryptedByteArraybyXOR[i] CONTAINS: " + encryptedByteArraybyXOR[i]); } System.out.println("\ndecryptedByteArraybyXOR.length IS: " + encryptedByteArraybyXOR.length); System.out.println("\ndecryptedByteArraybyXOR.toString() AS STRING IS: " + encryptedByteArraybyXOR.toString()); } </code></pre> <p>ANY ASSISTANCE IS APPRECIATED !!!!!</p>
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    1. USTokTok123
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    1. COIs there a reason that you're not just using [KeyCzar](http://www.keyczar.org/) for your crypto needs?
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      1. POJava - Decrypted string using XOR not producing original/encrypted string
      1. USMatt Ball
 

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