Java实现的对称加密算法3DES定义与用法示例-创新互联
本文实例讲述了Java实现的对称加密算法3DES定义与用法。分享给大家供大家参考,具体如下:
创新互联建站是一家专注于成都做网站、成都网站建设与策划设计,易门网站建设哪家好?创新互联建站做网站,专注于网站建设十载,网设计领域的专业建站公司;建站业务涵盖:易门等地区。易门做网站价格咨询:18982081108一 为什么出现3DES
1、返回柯克霍夫原则
2、存在安全问题
二 3DES(Triple DES或DESede)好处
1、密钥长度增强
2、迭代次数提高
三 3DES相关参数
四 3DES代码实现
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());//默认长度 SecretKey secretKey = keyGenerator.generateKey(); byte[] bytesKey = secretKey.getEncoded(); //KEY转换 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(); } } }
文章题目:Java实现的对称加密算法3DES定义与用法示例-创新互联
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