Package com.openstego.desktop

Class DataHidingPlugin

java.lang.Object

com.openstego.desktop.OpenStegoPlugin

com.openstego.desktop.DataHidingPlugin

public abstract class DataHidingPlugin
extends OpenStegoPlugin

Abstract class for stego plugins for OpenStego purpose of which is data hiding. It implements few methods which are specific for data hiding, and provides dummy implementation for the methods which are specific to watermarking purposes so that sub-class does not need to implement them

See Also:

WatermarkingPlugin

Nested Class Summary

Nested classes/interfaces inherited from class com.openstego.desktop.OpenStegoPlugin

OpenStegoPlugin.Purpose

Field Summary

Fields inherited from class com.openstego.desktop.OpenStegoPlugin

config

Constructor Summary

Constructors

Constructor	Description
DataHidingPlugin()

Method Summary

Modifier and Type	Method	Description
boolean	canHandle(byte[] stegoData)	Method to find out whether given stego data can be handled by this plugin or not
byte[]	generateSignature()	Method to generate the signature data.
double	getHighWatermarkLevel()	Method to get correlation value which above which it can be considered that watermark strength is high
double	getLowWatermarkLevel()	Method to get correlation value which below which it can be considered that watermark strength is low
java.util.List<OpenStegoPlugin.Purpose>	getPurposes()	Gives the purpose(s) of the plugin.
double	getWatermarkCorrelation(byte[] origSigData, byte[] watermarkData)	Method to check the correlation between original signature and the extracted watermark.

Methods inherited from class com.openstego.desktop.OpenStegoPlugin

checkMark, createConfig, createConfig, createConfig, embedData, extractData, extractMsgFileName, getConfig, getConfigClass, getDescription, getDiff, getEmbedOptionsUI, getName, getPurposesLabel, getReadableFileExtensions, getUsage, getWritableFileExtensions, populateStdCmdLineOptions

Methods inherited from class java.lang.Object

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

Constructor Detail

DataHidingPlugin

public DataHidingPlugin()

Method Detail

getPurposes

public final java.util.List<OpenStegoPlugin.Purpose> getPurposes()

Gives the purpose(s) of the plugin. This implementation returns only one value - Data Hiding

Specified by:

getPurposes in class OpenStegoPlugin

Returns:

Purpose(s) of the plugin

generateSignature

public final byte[] generateSignature()
                               throws OpenStegoException

Method to generate the signature data. This implementation returns null as this class is for data hiding plugins only

Specified by:

generateSignature in class OpenStegoPlugin

Returns:

Signature data

Throws:

OpenStegoException

getWatermarkCorrelation

public final double getWatermarkCorrelation(byte[] origSigData,
                                            byte[] watermarkData)
                                     throws OpenStegoException

Method to check the correlation between original signature and the extracted watermark. This implementation returns 0.0 as this class is for data hiding plugins only

Specified by:

getWatermarkCorrelation in class OpenStegoPlugin

Parameters:

origSigData - Original signature data

watermarkData - Extracted watermark data

Returns:

Correlation

Throws:

OpenStegoException

getHighWatermarkLevel

public double getHighWatermarkLevel()
                             throws OpenStegoException

Method to get correlation value which above which it can be considered that watermark strength is high

Specified by:

getHighWatermarkLevel in class OpenStegoPlugin

Returns:

High watermark

Throws:

OpenStegoException

getLowWatermarkLevel

public double getLowWatermarkLevel()
                            throws OpenStegoException

Method to get correlation value which below which it can be considered that watermark strength is low

Specified by:

getLowWatermarkLevel in class OpenStegoPlugin

Returns:

Low watermark

Throws:

OpenStegoException

canHandle

public final boolean canHandle(byte[] stegoData)

Method to find out whether given stego data can be handled by this plugin or not

Specified by:

canHandle in class OpenStegoPlugin

Parameters:

stegoData - Stego data containing the message

Returns:

Boolean indicating whether the stego data can be handled by this plugin or not