trex.Algo
Class StegoAlgoLSB

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

Direct Known Subclasses:

StegoAlgoLSBpp

public class StegoAlgoLSB

extends StegoAlgoRGB

This class implements the LSB Steganography Algorithm. Data is split into bits; the picture's red, green and blue share each carry one bit of data in each pixel.

Version:

$Revision: 1.21 $

Author:

Bastian Friedrich <bastian@bastian-friedrich.de>

Nested Class Summary

protected class	StegoAlgoLSB.LSBDecryptFilter LSBDecryptFilter is the decrypt filter for the LSB algorithm.
protected class	StegoAlgoLSB.LSBEncryptFilter LSBEncryptFilter is the encrypt filter for the LSB algorithm.

Field Summary

Fields inherited from class trex.Algo.StegoAlgo

passPhrase

Constructor Summary

StegoAlgoLSB()

Method Summary

Component	getConfigDialog() LSB does not have a config dialog - returns null.
protected 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.
String	getInfo() Return an info string about this algorithm.
boolean	hasConfigDialog() Return whether this algorithm has a config dialog.
boolean	hasPassPhrase() Return whether this algorithm needs a pass phrase.
boolean	pictureLargeEnough(ImageIcon img, String data) Return whether the passed picture is large enough to carry the data
boolean	validConfig() Return whether the config setup in the setup/passphrase dialog is valid.

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

StegoAlgoLSB

public StegoAlgoLSB()

Method Detail

validConfig

public boolean validConfig()

Return whether the config setup in the setup/passphrase dialog is valid. There is no setup in LSB -> true.

Specified by:

validConfig in class StegoAlgo

Returns:

true.

hasPassPhrase

public boolean hasPassPhrase()

Return whether this algorithm needs a pass phrase. LSB doesn't have a pass phrase -> false.

Specified by:

hasPassPhrase in class StegoAlgo

Returns:

false.

hasConfigDialog

public boolean hasConfigDialog()

Return whether this algorithm has a config dialog. LSB doesn't have a config dialog -> false.

Specified by:

hasConfigDialog in class StegoAlgo

Returns:

false.

getConfigDialog

public Component getConfigDialog()

LSB does not have a config dialog - returns null.

Specified by:

getConfigDialog in class StegoAlgo

Returns:

null.

See Also:

StegoAlgo.hasConfigDialog(), StegoAlgo.hasPassPhrase()

getInfo

public String getInfo()

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

Specified by:

getInfo in class StegoAlgo

Returns:

"Least significant bit algorithm"

pictureLargeEnough

public boolean pictureLargeEnough(ImageIcon img,
                                  String data)

Return whether the passed picture is large enough to carry the data

Specified by:

pictureLargeEnough in class StegoAlgo

Parameters:

img - Image to hide data in

data - data to hide

Returns:

Whether the img is large enough to carry data.

getDecryptFilter

protected TRexFilterRGB getDecryptFilter(int w,
                                         int h)

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

Specified by:

getDecryptFilter in class StegoAlgoRGB

Parameters:

w - Picture's width

h - Picture's height

Returns:

The ImageFilter that does all the work.

getEncryptFilter

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

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

Specified by:

getEncryptFilter in class StegoAlgoRGB

Parameters:

data - Data to hide while filtering

w - Picture's width

h - Picture's height

Returns:

The ImageFilter that does all the work.