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當(dāng)前位置:首頁(yè)  >  千鋒問(wèn)問(wèn)  > java對(duì)稱加密有哪些怎么操作

java對(duì)稱加密有哪些怎么操作

java對(duì)稱加密 匿名提問(wèn)者 2023-09-18 14:16:48

java對(duì)稱加密有哪些怎么操作

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推薦答案

  Java中提供了多種對(duì)稱加密算法,常用的有DES、AES和DESede。下面我將介紹這些算法的使用方法。

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  1.DES(Data Encryption Standard):DES是一種對(duì)稱加密算法,密鑰長(zhǎng)度固定為56位。Java中可以使用javax.crypto包中的Cipher類進(jìn)行DES加密。

  import javax.crypto.Cipher;

  import javax.crypto.SecretKey;

  import javax.crypto.SecretKeySpec;

  import java.nio.charset.StandardCharsets;

  import java.security.Key;

  import java.util.Base64;

  public class DESEncryptionExample {

  public static void main(String[] args) throws Exception {

  // 生成DES密鑰

  String keyString = "your_key";

  byte[] keyData = keyString.getBytes(StandardCharsets.UTF_8);

  Key desKey = new SecretKeySpec(keyData, "DES");

  // 創(chuàng)建DES加密對(duì)象

  Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");

  // 初始化加密模式

  cipher.init(Cipher.ENCRYPT_MODE, desKey);

  // 加密數(shù)據(jù)

  String plaintext = "Hello, World!";

  byte[] encryptedData = cipher.doFinal(plaintext.getBytes(StandardCharsets.UTF_8));

  // 對(duì)加密數(shù)據(jù)進(jìn)行Base64編碼

  String encryptedText = Base64.getEncoder().encodeToString(encryptedData);

  System.out.println("Encrypted Text: " + encryptedText);

  // 初始化解密模式

  cipher.init(Cipher.DECRYPT_MODE, desKey);

  // 解密數(shù)據(jù)

  byte[] decryptedData = cipher.doFinal(Base64.getDecoder().decode(encryptedText));

  // 輸出解密結(jié)果

  String decryptedText = new String(decryptedData, StandardCharsets.UTF_8);

  System.out.println("Decrypted Text: " + decryptedText);

  }

  }

  2.AES(Advanced Encryption Standard):AES是一種高級(jí)加密標(biāo)準(zhǔn),密鑰長(zhǎng)度可以是128、192或256位。Java中同樣可以使用javax.crypto包中的Cipher類進(jìn)行AES加密。

  import javax.crypto.Cipher;

  import javax.crypto.SecretKey;

  import javax.crypto.SecretKeySpec;

  import java.nio.charset.StandardCharsets;

  import java.security.Key;

  import java.util.Base64;

  public class AESEncryptionExample {

  public static void main(String[] args) throws Exception {

  // 生成AES密鑰

  String keyString = "your_key";

  byte[] keyData = keyString.getBytes(StandardCharsets.UTF_8);

  Key aesKey = new SecretKeySpec(keyData, "AES");

  // 創(chuàng)建AES加密對(duì)象

  Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

  // 初始化加密模式

  cipher.init(Cipher.ENCRYPT_MODE, aesKey);

  // 加密數(shù)據(jù)

  String plaintext = "Hello, World!";

  byte[] encryptedData = cipher.doFinal(plaintext.getBytes(StandardCharsets.UTF_8));

  // 對(duì)加密數(shù)據(jù)進(jìn)行Base64編碼

  String encryptedText = Base64.getEncoder().encodeToString(encryptedData);

  System.out.println("Encrypted Text: " + encryptedText);

  // 初始化解密模式

  cipher.init(Cipher.DECRYPT_MODE, aesKey);

  // 解密數(shù)據(jù)

  byte[] decryptedData = cipher.doFinal(Base64.getDecoder().decode(encryptedText));

  // 輸出解密結(jié)果

  String decryptedText = new String(decryptedData, StandardCharsets.UTF_8);

  System.out.println("Decrypted Text: " + decryptedText);

  }

  }

  3.DESede(Triple DES):DESede是對(duì)稱加密算法的一種,使用3個(gè)不同的密鑰對(duì)數(shù)據(jù)進(jìn)行加密。Java中同樣可以使用javax.crypto包中的Cipher類進(jìn)行DESede加密。

  import javax.crypto.Cipher;

  import javax.crypto.SecretKey;

  import javax.crypto.SecretKeySpec;

  import java.nio.charset.StandardCharsets;

  import java.security.Key;

  import java.util.Base64;

  public class DESedeEncryptionExample {

  public static void main(String[] args) throws Exception {

  // 生成DESede密鑰

  String keyString = "your_key";

  byte[] keyData = keyString.getBytes(StandardCharsets.UTF_8);

  Key desedeKey = new SecretKeySpec(keyData, "DESede");

  // 創(chuàng)建DESede加密對(duì)象

  Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");

  // 初始化加密模式

  cipher.init(Cipher.ENCRYPT_MODE, desedeKey);

  // 加密數(shù)據(jù)

  String plaintext = "Hello, World!";

  byte[] encryptedData = cipher.doFinal(plaintext.getBytes(StandardCharsets.UTF_8));

  // 對(duì)加密數(shù)據(jù)進(jìn)行Base64編碼

  String encryptedText = Base64.getEncoder().encodeToString(encryptedData);

  System.out.println("Encrypted Text: " + encryptedText);

  // 初始化解密模式

  cipher.init(Cipher.DECRYPT_MODE, desedeKey);

  // 解密數(shù)據(jù)

  byte[] decryptedData = cipher.doFinal(Base64.getDecoder().decode(encryptedText));

  // 輸出解密結(jié)果

  String decryptedText = new String(decryptedData, StandardCharsets.UTF_8);

  System.out.println("Decrypted Text: " + decryptedText);

  }

  }

  以上是使用Java進(jìn)行對(duì)稱加密的示例。請(qǐng)注意,在實(shí)際應(yīng)用中,保證密鑰的安全性非常重要。對(duì)稱加密算法通常用于加密較小的數(shù)據(jù),如果需要加密大量數(shù)據(jù)或保證更高的安全性,可以考慮使用混合加密方案,結(jié)合非對(duì)稱加密算法進(jìn)行密鑰交換和數(shù)據(jù)加密。

其他答案

  •   在Java中,對(duì)稱加密算法有許多選擇,其中最常用的包括DES、AES和DESede。下面我會(huì)詳細(xì)介紹每個(gè)算法的操作方法。

      1.DES(Data Encryption Standard):DES是一種基于56位密鑰長(zhǎng)度的對(duì)稱加密算法。下面是使用Java進(jìn)行DES加密和解密的示例代碼:

      import javax.crypto.Cipher;

      import javax.crypto.SecretKey;

      import javax.crypto.SecretKeyFactory;

      import javax.crypto.spec.DESKeySpec;

      import java.nio.charset.StandardCharsets;

      import java.security.Key;

      import java.util.Base64;

      public class DESEncryptionExample {

      public static void main(String[] args) throws Exception {

      // 生成DES密鑰

      String keyString = "your_key";

      byte[] keyData = keyString.getBytes(StandardCharsets.UTF_8);

      DESKeySpec desKeySpec = new DESKeySpec(keyData);

      SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

      SecretKey desKey = keyFactory.generateSecret(desKeySpec);

      // 創(chuàng)建DES加密對(duì)象

      Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");

      // 初始化加密模式

      cipher.init(Cipher.ENCRYPT_MODE, desKey);

      // 加密數(shù)據(jù)

      String plaintext = "Hello, World!";

      byte[] encryptedData = cipher.doFinal(plaintext.getBytes(StandardCharsets.UTF_8));

      // 對(duì)加密數(shù)據(jù)進(jìn)行Base64編碼

      String encryptedText = Base64.getEncoder().encodeToString(encryptedData);

      System.out.println("Encrypted Text: " + encryptedText);

      // 初始化解密模式

      cipher.init(Cipher.DECRYPT_MODE, desKey);

      // 解密數(shù)據(jù)

      byte[] decryptedData = cipher.doFinal(Base64.getDecoder().decode(encryptedText));

      // 輸出解密結(jié)果

      String decryptedText = new String(decryptedData, StandardCharsets.UTF_8);

      System.out.println("Decrypted Text: " + decryptedText);

      }

      }

      2.AES(Advanced Encryption Standard):AES是一種高級(jí)加密標(biāo)準(zhǔn),支持128位、192位和256位密鑰長(zhǎng)度。下面是使用Java進(jìn)行AES加密和解密的示例代碼:

      import javax.crypto.Cipher;

      import javax.crypto.SecretKey;

      import javax.crypto.SecretKeyFactory;

      import javax.crypto.spec.SecretKeySpec;

      import java.nio.charset.StandardCharsets;

      import java.security.Key;

      import java.util.Base64;

      public class AESEncryptionExample {

      public static void main(String[] args) throws Exception {

      // 生成AES密鑰

      String keyString = "your_key";

      byte[] keyData = keyString.getBytes(StandardCharsets.UTF_8);

      SecretKeySpec aesKeySpec = new SecretKeySpec(keyData, "AES");

      // 創(chuàng)建AES加密對(duì)象

      Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");

      // 初始化加密模式

      cipher.init(Cipher.ENCRYPT_MODE, aesKeySpec);

      // 加密數(shù)據(jù)

      String plaintext = "Hello, World!";

      byte[] encryptedData = cipher.doFinal(plaintext.getBytes(StandardCharsets.UTF_8));

      // 對(duì)加密數(shù)據(jù)進(jìn)行Base64編碼

      String encryptedText = Base64.getEncoder().encodeToString(encryptedData);

      System.out.println("Encrypted Text: " + encryptedText);

      // 初始化解密模式

      cipher.init(Cipher.DECRYPT_MODE, aesKeySpec);

      // 解密數(shù)據(jù)

      byte[] decryptedData = cipher.doFinal(Base64.getDecoder().decode(encryptedText));

      // 輸出解密結(jié)果

      String decryptedText = new String(decryptedData, StandardCharsets.UTF_8);

      System.out.println("Decrypted Text: " + decryptedText);

      }

      }

      3.DESede(Triple DES):DESede是對(duì)稱加密算法的一種,使用3個(gè)不同的密鑰對(duì)數(shù)據(jù)進(jìn)行加密。下面是使用Java進(jìn)行DESede加密和解密的示例代碼:

      import javax.crypto.Cipher;

      import javax.crypto.SecretKey;

      import javax.crypto.SecretKeyFactory;

      import javax.crypto.spec.DESedeKeySpec;

      import java.nio.charset.StandardCharsets;

      import java.security.Key;

      import java.util.Base64;

      public class DESedeEncryptionExample {

      public static void main(String[] args) throws Exception {

      // 生成DESede密鑰

      String keyString = "your_key";

      byte[] keyData = keyString.getBytes(StandardCharsets.UTF_8);

      DESedeKeySpec desedeKeySpec = new DESedeKeySpec(keyData);

      SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede");

      SecretKey desedeKey = keyFactory.generateSecret(desedeKeySpec);

      // 創(chuàng)建DESede加密對(duì)象

      Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");

      // 初始化加密模式

      cipher.init(Cipher.ENCRYPT_MODE, desedeKey);

      // 加密數(shù)據(jù)

      String plaintext = "Hello, World!";

      byte[] encryptedData = cipher.doFinal(plaintext.getBytes(StandardCharsets.UTF_8));

      // 對(duì)加密數(shù)據(jù)進(jìn)行Base64編碼

      String encryptedText = Base64.getEncoder().encodeToString(encryptedData);

      System.out.println("Encrypted Text: " + encryptedText);

      // 初始化解密模式

      cipher.init(Cipher.DECRYPT_MODE, desedeKey);

      // 解密數(shù)據(jù)

      byte[] decryptedData = cipher.doFinal(Base64.getDecoder().decode(encryptedText));

      // 輸出解密結(jié)果

      String decryptedText = new String(decryptedData, StandardCharsets.UTF_8);

      System.out.println("Decrypted Text: " + decryptedText);

      }

      }

      以上是使用Java進(jìn)行對(duì)稱加密的示例代碼。為了確保數(shù)據(jù)的安全性,請(qǐng)謹(jǐn)慎保管密鑰,并采用適當(dāng)?shù)拿荑€管理策略。

  •   在Java中,有幾種常見(jiàn)的對(duì)稱加密算法可以用來(lái)保護(hù)數(shù)據(jù)的機(jī)密性,包括DES、AES和RC4等。下面將逐個(gè)介紹這些算法的操作方法。

      1.DES(Data Encryption Standard):DES是一種對(duì)稱加密算法,使用相同的密鑰進(jìn)行加密和解密。它使用64位密鑰和64位數(shù)據(jù)塊,并應(yīng)用一系列的加密輪次。以下是使用DES進(jìn)行加密和解密的示例代碼:

      import javax.crypto.Cipher;

      import javax.crypto.spec.SecretKeySpec;

      public class DESExample {

      public static void main(String[] args) throws Exception {

      String plainText = "Hello, World!";

      String key = "ThisIsAKey123456";

      // 加密

      Cipher cipher = Cipher.getInstance("DES");

      SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), "DES");

      cipher.init(Cipher.ENCRYPT_MODE, secretKey);

      byte[] encryptedBytes = cipher.doFinal(plainText.getBytes());

      String encryptedText = new String(encryptedBytes);

      // 解密

      cipher.init(Cipher.DECRYPT_MODE, secretKey);

      byte[] decryptedBytes = cipher.doFinal(encryptedBytes);

      String decryptedText = new String(decryptedBytes);

      System.out.println("Encrypted text: " + encryptedText);

      System.out.println("Decrypted text: " + decryptedText);

      }

      }

      2.AES(Advanced Encryption Standard):AES是一種高級(jí)的對(duì)稱加密算法,用于替代DES。它支持128位、192位和256位的密鑰長(zhǎng)度,并且比DES更安全可靠。以下是使用AES進(jìn)行加密和解密的示例代碼:

      import javax.crypto.Cipher;

      import javax.crypto.spec.SecretKeySpec;

      public class AESExample {

      public static void main(String[] args) throws Exception {

      String plainText = "Hello, World!";

      String key = "ThisIsAKey123456";

      // 加密

      Cipher cipher = Cipher.getInstance("AES");

      SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), "AES");

      cipher.init(Cipher.ENCRYPT_MODE, secretKey);

      byte[] encryptedBytes = cipher.doFinal(plainText.getBytes());

      String encryptedText = new String(encryptedBytes);

      // 解密

      cipher.init(Cipher.DECRYPT_MODE, secretKey);

      byte[] decryptedBytes = cipher.doFinal(encryptedBytes);

      String decryptedText = new String(decryptedBytes);

      System.out.println("Encrypted text: " + encryptedText);

      System.out.println("Decrypted text: " + decryptedText);

      }

      }

      3.RC4:RC4是一種流密碼,它使用變長(zhǎng)密鑰來(lái)加密數(shù)據(jù)流。以下是使用RC4進(jìn)行加密和解密的示例代碼:

      import javax.crypto.Cipher;

      import javax.crypto.spec.SecretKeySpec;

      public class RC4Example {

      public static void main(String[] args) throws Exception {

      String plainText = "Hello, World!";

      String key = "ThisIsAKey123456";

      // 加密

      Cipher cipher = Cipher.getInstance("RC4");

      SecretKeySpec secretKey = new SecretKeySpec(key.getBytes(), "RC4");

      cipher.init(Cipher.ENCRYPT_MODE, secretKey);

      byte[] encryptedBytes = cipher.update(plainText.getBytes());

      String encryptedText = new String(encryptedBytes);

      // 解密

      cipher.init(Cipher.DECRYPT_MODE, secretKey);

      byte[] decryptedBytes = cipher.update(encryptedBytes);

      String decryptedText = new String(decryptedBytes);

      System.out.println("Encrypted text: " + encryptedText);

      System.out.println("Decrypted text: " + decryptedText);

      }

      }

      以上是對(duì)稱加密算法的一些常見(jiàn)示例代碼,您可以根據(jù)實(shí)際需求選擇適合的算法和密鑰長(zhǎng)度來(lái)保護(hù)數(shù)據(jù)的安全性。請(qǐng)注意,加密算法的安全性不僅取決于算法本身,還取決于密鑰和加密方式的安全管理。