根据您给的文档内容，

对称加密实现

java import javax.crypto.Cipher; import javax.crypto.spec.SecretKeySpec; import org.apache.commons.codec.binary.Base64;

public class AESUtil {

public static String encrypt throws Exception {
    SecretKeySpec secretKeySpec = new SecretKeySpec, "AES");
    Cipher cipher = Cipher.getInstance;
    cipher.init;
    byte encryptedData = cipher.doFinal);
    return new String);
}
public static String decrypt throws Exception {
    SecretKeySpec secretKeySpec = new SecretKeySpec, "AES");
    Cipher cipher = Cipher.getInstance;
    cipher.init;
    byte encryptedBytes = Base64.decodeBase64);
    byte decryptedData = cipher.doFinal;
    return new String;
}

}

java import java.security.KeyPair; import java.security.KeyPairGenerator; import java.security.PrivateKey; import java.security.PublicKey; import java.security.Cipher; import org.apache.commons.codec.binary.Base64;

public static KeyPair generateKeyPair throws Exception {
    KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance;
    keyPairGenerator.initialize;
    KeyPair keyPair = keyPairGenerator.generateKeyPair;
    return keyPair;
}
public static String encrypt throws Exception {
    Cipher cipher = Cipher.getInstance;
    cipher.init;
    byte encryptedData = cipher.doFinal);
    return new String);
}
public static String decrypt throws Exception {
    Cipher cipher = Cipher.getInstance;
    cipher.init;
    byte encryptedBytes = Base64.decodeBase64);
    byte decryptedData = cipher.doFinal;
    return new String;
}

对称加密与非对称加密的结合

在实际应用中，Neng用非对称加密来平安地共享对称加密的密钥。

java public class EncryptionExample {

public static void main throws Exception {
    // 生成RSA密钥对
    KeyPair keyPair = RSAUtil.generateKeyPair;
    PublicKey publicKey = keyPair.getPublic;
    PrivateKey privateKey = keyPair.getPrivate;
    // 生成AES密钥
    String aesKey = "1234567890123456"; // 16字节密钥
    // 用非对称加密AES密钥
    String encryptedAESKey = RSAUtil.encrypt;
    // 用对称加密算法加密数据
    String data = "Hello, World!";
    String encryptedData = AESUtil.encrypt;
    // 打印后来啊
    System.out.println;
    System.out.println;
    // 解密AES密钥
    String decryptedAESKey = RSAUtil.decrypt;
    // 用解密后的AES密钥解密数据
    String decryptedData = AESUtil.decrypt;
    // 验证后来啊
    System.out.println;
}

在这玩意儿示例中， 我们先说说用RSA算法生成密钥对，然后用公钥加密AES密钥，将加密后的AES密钥发送给接收方。接收方用私钥解密AES密钥，然后用AES密钥加密数据。这样，即使数据被截获，打者也无法解密数据，基本上原因是需要私钥来解密AES密钥。