hcrypto.analyzer
Class CaesarAnalyzer

java.lang.Object
  |
  +--java.awt.Component
        |
        +--java.awt.Container
              |
              +--java.awt.Window
                    |
                    +--java.awt.Frame
                          |
                          +--hcrypto.analyzer.AnalyzerFrame
                                |
                                +--hcrypto.analyzer.CaesarAnalyzer

All Implemented Interfaces:

javax.accessibility.Accessible, Analyzer, java.awt.image.ImageObserver, java.awt.MenuContainer, java.io.Serializable

public class CaesarAnalyzer

extends AnalyzerFrame

implements Analyzer

See Also:

Serialized Form

Inner classes inherited from class java.awt.Frame

java.awt.Frame.AccessibleAWTFrame

Inner classes inherited from class java.awt.Window

java.awt.Window.AccessibleAWTWindow

Inner classes inherited from class java.awt.Container

java.awt.Container.AccessibleAWTContainer

Inner classes inherited from class java.awt.Component

java.awt.Component.AccessibleAWTComponent

Fields inherited from class hcrypto.analyzer.AnalyzerFrame

display, HEIGHT, WIDTH

Fields inherited from class java.awt.Frame

CROSSHAIR_CURSOR, DEFAULT_CURSOR, E_RESIZE_CURSOR, HAND_CURSOR, ICONIFIED, MOVE_CURSOR, N_RESIZE_CURSOR, NE_RESIZE_CURSOR, NORMAL, NW_RESIZE_CURSOR, S_RESIZE_CURSOR, SE_RESIZE_CURSOR, SW_RESIZE_CURSOR, TEXT_CURSOR, W_RESIZE_CURSOR, WAIT_CURSOR

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface hcrypto.analyzer.Analyzer

DECIPHER_LIMIT

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, PROPERTIES, SOMEBITS

Constructor Summary

CaesarAnalyzer()

CaesarAnalyzer(TextStatistics ts)

Method Summary

void	doAnalysis() This method performs an analysis of the text assuming a Caesar (shift) cipher was used.
int	getOptimalShift() This method performs a Chi-Square test to find the optimal shift.
int	getOptimalShift(int firstChar, int displ) This method performs a Chi-Square test to find the optimal Caesar shift on a polyalphabetic text.
java.lang.String	getReport()
void	run()
void	setup(java.lang.String text)
java.lang.String	toString()

Methods inherited from class hcrypto.analyzer.AnalyzerFrame

buildGUI, centerWindow

Methods inherited from class java.awt.Frame

addNotify, finalize, getAccessibleContext, getCursorType, getFrames, getIconImage, getMenuBar, getState, getTitle, isResizable, paramString, remove, removeNotify, setCursor, setIconImage, setMenuBar, setResizable, setState, setTitle

Methods inherited from class java.awt.Window

addWindowListener, applyResourceBundle, applyResourceBundle, dispose, getFocusOwner, getGraphicsConfiguration, getInputContext, getListeners, getLocale, getOwnedWindows, getOwner, getToolkit, getWarningString, hide, isShowing, pack, postEvent, processEvent, processWindowEvent, removeWindowListener, setCursor, show, toBack, toFront

Methods inherited from class java.awt.Container

add, add, add, add, add, addContainerListener, addImpl, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getInsets, getLayout, getMaximumSize, getMinimumSize, getPreferredSize, insets, invalidate, isAncestorOf, layout, list, list, locate, minimumSize, paint, paintComponents, preferredSize, print, printComponents, processContainerEvent, remove, remove, removeAll, removeContainerListener, setFont, setLayout, update, validate, validateTree

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addPropertyChangeListener, addPropertyChangeListener, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, disable, disableEvents, dispatchEvent, enable, enable, enableEvents, enableInputMethods, firePropertyChange, getBackground, getBounds, getBounds, getColorModel, getComponentOrientation, getCursor, getDropTarget, getFont, getFontMetrics, getForeground, getGraphics, getHeight, getInputMethodRequests, getLocation, getLocation, getLocationOnScreen, getName, getParent, getPeer, getSize, getSize, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, imageUpdate, inside, isDisplayable, isDoubleBuffered, isEnabled, isFocusTraversable, isLightweight, isOpaque, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, prepareImage, prepareImage, printAll, processComponentEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, reshape, resize, resize, setBackground, setBounds, setBounds, setComponentOrientation, setDropTarget, setEnabled, setForeground, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, size, transferFocus

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.awt.MenuContainer

getFont, postEvent

Constructor Detail

CaesarAnalyzer

public CaesarAnalyzer()

CaesarAnalyzer

public CaesarAnalyzer(TextStatistics ts)
               throws java.lang.NullPointerException

Method Detail

setup

public void setup(java.lang.String text)

Specified by:

setup in interface Analyzer

run

public void run()

Specified by:

run in interface Analyzer

getReport

public java.lang.String getReport()

Specified by:

getReport in interface Analyzer

toString

public java.lang.String toString()

Overrides:

toString in class java.awt.Component

doAnalysis

public void doAnalysis()

This method performs an analysis of the text assuming a Caesar (shift) cipher was used. The goal is to find the shift (the Caesar key). It performs a Chi-square analysis on every possible shift to find the most likely shift.

getOptimalShift

public int getOptimalShift()

This method performs a Chi-Square test to find the optimal shift. This monoalphabetic version calls the more general polyalphabetic version, which computes a chi-square test on a text beginning with the first (0th) character and proceeding through each adjacent character.

getOptimalShift

public int getOptimalShift(int firstChar,
                           int displ)

This method performs a Chi-Square test to find the optimal Caesar shift on a polyalphabetic text. It assumes that every _displ_ character starting at _firstChar_ belongs to the same alphabet. It is used primarily for analyzing Vigenere-like and Caesar-shift cryptograms.

Parameters:

firstChar - - the location of the first character in the cryptotext

displ - - the displacement (keyword length) or cycle length