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      當(dāng)前位置:首頁  >  千鋒問問  > 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 匿名提問者 2023-09-18 14:16:48

      java對(duì)稱加密有哪些怎么操作

      我要提問

      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。

      千鋒教育

        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,有幾種常見的對(duì)稱加密算法可以用來保護(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。