恺撒密码
原理：明文中的所有字母都在字母表上向后（或向前）按照一个固定数目进行偏移后被替换成密文。
源码如下
package com.mima.method;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
/**
* 凯撒密码
* @author jpp
* 2019年2月27日下午12:51:39
*/
public class Kaisa {
//秘钥字母表
final static String[] CHARACTER = {
"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
"n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"
};
//秘钥字母表长度
final static int N = 26;
/**
* 凯撒加密算法
* @param plaintext 明文
* @param k 秘钥
* @return mi 密文
*/
public static String encryptionKaisa(String plaintext , int k){
StringBuilder mi = new StringBuilder();
int t,s;
//对明文的每个字符逐个处理，进行加密
char[] ming=plaintext.toCharArray();
for(int i=0;i<ming.length;i++){
//获取该字节在字母表中的序号
t=ming[i]-97;
//防止越界
if (t<0 || t>N) {
mi.append(ming[i]);
continue;
}
//加密
s=(t+k)%N;
mi.append(CHARACTER[s]);
}
return mi.toString();
}
/**
* 凯撒密码解密方法 （需输入正确的秘钥k才能解密出正确的明文）
* @param cipher 密文
* @param k 秘钥
* @return
*/
public static String decryptionKaisa(String cipher,int k) {
StringBuilder ming = new StringBuilder();
int t,s;
//对明文的每个字符逐个处理，进行加密
char[] mi=cipher.toCharArray();
for(int i=0;i<mi.length;i++){
//获取该字节在字母表中的序号
t=mi[i]-97;
//防止越界
if (t<0 || t>N) {
ming.append(mi[i]);
continue;
}
//解密
if (t>=k) {
s=t-k;
} else {
s=N+t-k;
}
ming.append(CHARACTER[s]);
}
return ming.toString();
}
public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, UnsupportedLookAndFeelException {
// TODO Auto-generated method stub
String ming = "security";
System.out.println("明文："+ming);
String mi=encryptionKaisa(ming,3);
System.out.println("密文："+mi);
System.out.println("解密后:"+decryptionKaisa(mi,3));
KaisaView kaisaTestView = new KaisaView();
}
}
class KaisaView extends JFrame{
JTextField jtfming;//明文
JTextField jtfmiyao;//秘钥
JTextField jtfmi;//密文
JTextField jtfjiemi;//解密
JButton jbt_jia;//����
JButton jbt_jie;//����
String mi_res;
String ming_res;
public KaisaView() throws ClassNotFoundException, InstantiationException, IllegalAccessException, UnsupportedLookAndFeelException{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
Toolkit kit = Toolkit.getDefaultToolkit();
Dimension screenSize = kit.getScreenSize();
int x = (screenSize.width - 485) / 2;
int y = (screenSize.height - 380) / 2;
setTitle("凯撒加解密测试");
setBounds(x, y, 485, 200);//���ڴ�С
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
setLayout(null);
jbt_jia = new JButton("加密");
jbt_jia.setBounds(400, 80, 60, 25);
jbt_jia.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
mi_res= Kaisa.encryptionKaisa(jtfming.getText(), Integer.valueOf(jtfmiyao.getText()));
System.out.println(mi_res);
jtfmi.setText(mi_res);
}
});
JLabel jl=new JLabel("明文:");
jl.setBounds(10,5,80,20);
jtfming=new JTextField("security");
jtfming.setBounds(100,5,360,25);
JLabel j2=new JLabel("密钥:");
j2.setBounds(10,30,80,20);
jtfmiyao=new JTextField("3");
jtfmiyao.setBounds(100,30,360,25);
jbt_jie = new JButton("解密");
jbt_jie.setBounds(400, 130, 60, 25);
jbt_jie.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
ming_res = Kaisa.decryptionKaisa(jtfmi.getText(), Integer.valueOf(jtfmiyao.getText()));
jtfjiemi.setText(ming_res);
}
});
JLabel jl1=new JLabel("加密后↓↓↓");
jl1.setBounds(10,55,100,20);
jtfmi=new JTextField("");
jtfmi.setBounds(10,80,360,25);
JLabel jl2=new JLabel("解密后↓↓↓");
jl2.setBounds(10,105,100,20);
jtfjiemi=new JTextField("");
jtfjiemi.setBounds(10,130,360,25);
add(jbt_jia);
add(jbt_jie);
add(jl);
add(j2);
add(jl1);
add(jl2);
add(jtfming);
add(jtfmi);
add(jtfmiyao);
add(jtfjiemi);
setVisible(true);
}
}
仿射密码
加密函数：s=(3*t+5)%N
解密函数：s=((t-5+26)*9)%N
package com.mima.method;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Fangshe {
//秘钥字母表
final static String[] CHARACTER = {
"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m",
"n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"
};
//秘钥字母表长度
final static int N = 26;
public static String encryptionFangshe(String plaintest){
StringBuilder mi = new StringBuilder();
int t,s;
//对明文的每个字符逐个处理，进行加密
char[] ming=plaintest.toCharArray();
for(int i=0;i<ming.length;i++){
//获取该字节在字母表中的序号
t=ming[i]-97;//明文编号
//防止越界
if (t<0 || t>N) {
mi.append(ming[i]);
continue;
}
//加密
s=(3*t+5)%N;//密文编号
mi.append(CHARACTER[s]);
}
return mi.toString();
}
/**
* Fangshe密码解密函数
* @param plaintest 密文
* @return
*/
public static String decryptionFangshe(String plaintest){
StringBuilder mi = new StringBuilder();
int t,s;
//对明文的每个字符逐个处理，进行加密
char[] ming=plaintest.toCharArray();
for(int i=0;i<ming.length;i++){
//获取该字节在字母表中的序号
t=ming[i]-97;//明文编号
//防止越界
if (t<0 || t>N) {
mi.append(ming[i]);
continue;
}
//解密
s=((t-5+26)*9)%N;//密文编号
mi.append(CHARACTER[s]);
}
return mi.toString();
}
public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, UnsupportedLookAndFeelException {
// TODO Auto-generated method stub
String ming = "security";
System.out.println("明文："+ming);
String mi=encryptionFangshe(ming);
System.out.println("密文："+mi);
System.out.println("解密后:"+decryptionFangshe(mi));
FangsheView fangsheView = new FangsheView();
}
}
class FangsheView extends JFrame{
/**
*
*/
private static final long serialVersionUID = 1L;
JTextField jtfming;//明文
JTextField jtfmiyao;//密钥
JTextField jtfmi;//密文
JTextField jtfjiemi;//解密
JButton jbt_jia;//加密
JButton jbt_jie;//解密
String mi_res;
String ming_res;
public FangsheView() throws ClassNotFoundException, InstantiationException, IllegalAccessException, UnsupportedLookAndFeelException{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
Toolkit kit = Toolkit.getDefaultToolkit();
Dimension screenSize = kit.getScreenSize();
int x = (screenSize.width - 485) / 2;
int y = (screenSize.height) / 2;
setTitle("仿射算法加解密测试");
setBounds(x, y, 485, 200);//窗口大小
setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
setLayout(null);
jbt_jia = new JButton("加密");
jbt_jia.setBounds(400, 80, 60, 25);
jbt_jia.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
mi_res= Fangshe.encryptionFangshe(jtfming.getText());
System.out.println(mi_res);
jtfmi.setText(mi_res);
}
});
JLabel jl=new JLabel("请输入明文:");
jl.setBounds(10,5,80,20);
jtfming=new JTextField("security");
jtfming.setBounds(100,5,360,25);
// JLabel j2=new JLabel("请输入秘钥:");
// j2.setBounds(10,30,80,20);
// jtfmiyao=new JTextField("3");
// jtfmiyao.setBounds(100,30,360,25);
jbt_jie = new JButton("解密");
jbt_jie.setBounds(400, 130, 60, 25);
jbt_jie.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// TODO Auto-generated method stub
ming_res = Fangshe.decryptionFangshe(jtfmi.getText());
jtfjiemi.setText(ming_res);
}
});
JLabel jl1=new JLabel("密文如下：");
jl1.setBounds(10,55,100,20);
jtfmi=new JTextField("");
jtfmi.setBounds(10,80,360,25);
JLabel jl2=new JLabel("解密结果：");
jl2.setBounds(10,105,100,20);
jtfjiemi=new JTextField("");
jtfjiemi.setBounds(10,130,360,25);
add(jbt_jia);
add(jbt_jie);
add(jl);
// add(j2);
add(jl1);
add(jl2);
add(jtfming);
add(jtfmi);
// add(jtfmiyao);
add(jtfjiemi);
setVisible(true);
}
}