The encryption algorithm is not strong enoug

本文解决加密解密过程中常见的两大问题:一是加密算法强度不足,需在配置文件中设置密钥;二是因JRE默认JCE版本限制导致无法初始化,需替换为无长度限制的JCE版本。

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使用加密解密出现以下问题的解决办法:

1、 The encryption algorithm is not strong enoug

原因:因为我们没有在bootstrap.properties配置文件中配置密钥。

解决办法:在bootstrap.properties文件中配置密钥:encrypt.key=hdnspace12334566

2、Unable to initialize due to invalid secret key

控制台出现:java.security.InvalidKeyException: Illegal key size

原因:这是因为JRE中自带的JCE功能,默认使用的是有长度限制的版本,我们要将其替换成不限长度的JCE版本。

解决办法:通过下载jce8下载, 下载之后进行解压,有如下三个文件:

我们将local_policy.jar和US_export_policy.jar两个文件复制到jre目录下的security目录中(如:E:\java_dev\Java\jdk1.8.0_121\jre\lib\security),覆盖掉默认的内容就OK了!

AES (Advanced Encryption Standard) is a widely adopted symmetric-key cryptographic algorithm, which stands for Advanced Encryption Standard. It's highly secure and efficient for encrypting data in Java. When using AES for encryption, it's crucial to employ a secure mode of operation to ensure the confidentiality and integrity of your data. In Java, the `javax.crypto.Cipher` class provides various modes of operation for symmetric ciphers, including AES. Here are some secure modes you should consider: 1. **AES/CBC (Cipher Block Chaining)**: This mode is often preferred because it adds an initialization vector (IV) before each block of plaintext. CBC ensures that each block depends on the previous one, making it more resistant to known-plaintext attacks. You'll need to securely manage the IV to maintain secrecy. 2. **AES/GCM (Galois/Counter Mode)**: GCM is a popular authenticated encryption mode that combines encryption with message authentication code (MAC). It offers both confidentiality and integrity protection in a single step, making it a good choice when you want to prevent tampering. 3. **AES/CTR (Counter mode)**: CTR also provides confidentiality but without built-in integrity checking like GCM. However, it's suitable if you plan to apply separate MAC or hash functions for authenticity. To use AES with a secure mode in Java, follow these steps: ```java import javax.crypto.Cipher; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; import java.nio.charset.StandardCharsets; import java.security.SecureRandom; // Generate a random secret key and initialization vector SecretKeySpec key = new SecretKeySpec(secretKey.getBytes(StandardCharsets.UTF_8), "AES"); IvParameterSpec iv = new IvParameterSpec(randomIV.getBytes(StandardCharsets.UTF_8)); // Create a Cipher instance and set the mode (CBC or GCM) Cipher cipher; if (mode == Cipher.ENCRYPT_MODE) { cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); // For CBC } else if (mode == Cipher.DECRYPT_MODE) { cipher = Cipher.getInstance("AES/CBC/PKCS5Padding"); // Same for decryption // If using GCM, use Cipher.getInstance("AES/GCM/NoPadding") } // Initialize the cipher with the key and IV cipher.init(mode, key, iv); byte[] encryptedData = cipher.doFinal(plaintext); ``` Remember to keep the key and IV secure, as they're critical for decryption. The IV should be randomly generated and not reused for multiple encryptions.
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