Databases
StackOverflow2013
Postsdbo
POWhy is RC4 not able to handle large amount of encrypted data?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POWhy is RC4 not able to handle large amount of encrypted data?
    primarykey
    data
    text
    <p>I have following code that decrypts a file.</p> <pre><code>package encryption; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.InputStream; import java.io.OutputStream; import java.security.Security; import javax.crypto.Cipher; import javax.crypto.CipherInputStream; import javax.crypto.SecretKey; import javax.crypto.SecretKeyFactory; import javax.crypto.spec.PBEKeySpec; import org.bouncycastle.jce.provider.BouncyCastleProvider; public class Decrypter { private static final String PASSWORD = "t_9Y#i@eT[h3}-7!"; private static final String KEY_ALGORITHM = "PBEWithMD5AndDES"; private static final String CIPHER_ALGORITHM = "RC4"; //Using Salsa20 or HC256 solves the problem private static final String PROVIDER = "BC"; public static void main(String[] args) throws Exception { Security.addProvider(new BouncyCastleProvider()); File inputFile = new File(args[0]); File outputFile = new File(args[1]); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(KEY_ALGORITHM); SecretKey key = keyFactory.generateSecret(new PBEKeySpec(PASSWORD.toCharArray())); Cipher cipher = Cipher.getInstance(CIPHER_ALGORITHM); cipher.init(Cipher.DECRYPT_MODE, key); InputStream inputStream = new FileInputStream(inputFile); OutputStream outputStream = new FileOutputStream(outputFile); CipherInputStream cipherInputStream = new CipherInputStream(inputStream, cipher); byte []byteBuffer = new byte[(int)inputFile.length()]; cipherInputStream.read(byteBuffer); outputStream.write(byteBuffer); //Only 512bytes of decrypted data is written to file, the rest becomes null outputStream.close(); } } </code></pre> <p>My question is what am I doing wrong? Why doesn't RC4 decrypt a block of size more than 512 bytes.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USartbristol
    1. USMonika Michael
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload