hcrypto.analyzer
Class AffineAnalyzer

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

All Implemented Interfaces:

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

public class AffineAnalyzer

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

AffineAnalyzer()

AffineAnalyzer(TextStatistics ts)

Method Summary

void	doAnalysis() This method prints an analysis of the text assuming a Affine (linear) cipher was used.
double	getChiSquare(java.lang.String 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

AffineAnalyzer

public AffineAnalyzer()

AffineAnalyzer

public AffineAnalyzer(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 prints an analysis of the text assuming a Affine (linear) cipher was used. The goal is to find the values of A and B in y = Ax + B. If we assume an alphabet of a..z, then A can take on the values 1, 3, 5, 7, 9, 11, 15, 17, 19, 21, 23, 25. These are the values for which gcd(A, 26) = 1. B can take on the values 0..25. So there are 12 x 26 = 312 possible keys. This method does an exhaustive search of these keys using Chi-square test to identify the optimum key.

getChiSquare

public double getChiSquare(java.lang.String text)