trex.Algo
Class StegoAlgoLSBpp

java.lang.Object
  |
  +--trex.Algo.StegoAlgo
        |
        +--trex.Algo.StegoAlgoRGB
              |
              +--trex.Algo.StegoAlgoLSB
                    |
                    +--trex.Algo.StegoAlgoLSBpp

public class StegoAlgoLSBpp

extends StegoAlgoLSB

This class adds a (very little) bit of security to the LSB algorithm by XORing every input character with a character from the passphrase.

Version:

$Revision: 1.7 $

Author:

Bastian Friedrich <bastian@bastian-friedrich.de>

Nested Class Summary

protected class

StegoAlgoLSBpp.LSBppDecryptFilter This class adds the XOR functionality to the "getData" function.

Nested classes inherited from class trex.Algo.StegoAlgoLSB

StegoAlgoLSB.LSBEncryptFilter

Field Summary

Fields inherited from class trex.Algo.StegoAlgo

passPhrase

Constructor Summary

StegoAlgoLSBpp()

Method Summary

TRexFilterRGB	getDecryptFilter(int w, int h) Return a decrypt filter for this algorithm.
protected TRexFilterRGB	getEncryptFilter(String data, int w, int h) Return an encrypt filter for this algorithm (identical to LSB) and XOR data with pass phrase beforehand.
String	getInfo() Return an info string about this algorithm.
boolean	hasPassPhrase() Return true.

Methods inherited from class trex.Algo.StegoAlgoLSB

getConfigDialog, hasConfigDialog, pictureLargeEnough, validConfig

Methods inherited from class trex.Algo.StegoAlgoRGB

defaultAmplification, getDecrypted, getEncrypted

Methods inherited from class trex.Algo.StegoAlgo

setPassPhrase

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

StegoAlgoLSBpp

public StegoAlgoLSBpp()

Method Detail

hasPassPhrase

public boolean hasPassPhrase()

Return true.

Overrides:

hasPassPhrase in class StegoAlgoLSB

Returns:

false.

getInfo

public String getInfo()

Return an info string about this algorithm. Contains the algorithm's name.

Overrides:

getInfo in class StegoAlgoLSB

Returns:

"Least significant bit algorithm, XORing pass phrase".

getEncryptFilter

protected TRexFilterRGB getEncryptFilter(String data,
                                         int w,
                                         int h)

Return an encrypt filter for this algorithm (identical to LSB) and XOR data with pass phrase beforehand. Actually called by "virtual" method StegoAlgoRGB.getDecrypted(javax.swing.ImageIcon).

Overrides:

getEncryptFilter in class StegoAlgoLSB

Parameters:

data - Data to hide while filtering

w - Picture's width

h - Picture's height

Returns:

The ImageFilter that does all the work.

getDecryptFilter

public TRexFilterRGB getDecryptFilter(int w,
                                      int h)

Return a decrypt filter for this algorithm. Actually called by "virtual" method StegoAlgoRGB.getDecrypted(javax.swing.ImageIcon).

Overrides:

getDecryptFilter in class StegoAlgoLSB

Parameters:

w - Picture's width

h - Picture's height

Returns:

The ImageFilter that does all the work.