本文實例講述了java實現的對稱加密算法3des定義與用法。分享給大家供大家參考，具體如下：
一 為什么出現3des
1、返回柯克霍夫原則
2、存在安全問題
二 3des（triple des或desede）好處
1、密鑰長度增強
2、迭代次數提高
三 3des相關參數
四 3des代碼實現
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
|
package com.imooc.security.des;import java.security.key;import java.security.securerandom;import javax.crypto.cipher;import javax.crypto.keygenerator;import javax.crypto.secretkey;import javax.crypto.secretkeyfactory;import javax.crypto.spec.desedekeyspec;import org.apache.commons.codec.binary.base64;public class imooc3des { private static string src = "cakin24 security 3des"; public static void main(string[] args) { jdk3des(); } public static void jdk3des() { try { //生成key keygenerator keygenerator = keygenerator.getinstance("desede"); //keygenerator.init(168); keygenerator.init(new securerandom());//默認長度 secretkey secretkey = keygenerator.generatekey(); byte[] byteskey = secretkey.getencoded(); //key轉換 desedekeyspec desedekeyspec = new desedekeyspec(byteskey); secretkeyfactory factory = secretkeyfactory.getinstance("desede"); key convertsecretkey = factory.generatesecret(desedekeyspec); //加密 cipher cipher = cipher.getinstance("desede/ecb/pkcs5padding"); cipher.init(cipher.encrypt_mode, convertsecretkey); byte[] result = cipher.dofinal(src.getbytes()); system.out.println("jdk 3des encrypt : " + base64.encodebase64string(result)); //解密 cipher.init(cipher.decrypt_mode, convertsecretkey); result = cipher.dofinal(result); system.out.println("jdk 3des decrypt : " + new string(result)); } catch (exception e) { e.printstacktrace(); } }} |
五 實現效果
jdk 3des encrypt : 6t7a/rnardzsl+mtezvbfxwnnzr0yjbw
jdk 3des decrypt : cakin24 security 3des
注：這里引入了org.apache.commons.codec.binary.base64包，可點擊此處本站下載。
希望本文所述對大家java程序設計有所幫助。
原文鏈接：https://blog.csdn.net/chengqiuming/article/details/78746057
