Use the Base64 framework in the Java class library to perform data encryption technical principles

Title: Use the Base64 framework in the Java library to perform data encryption technical principles Overview: Base64 is a commonly used data encoding method. By converting the data into a string containing only ASCII characters, it can be transmitted and stored without changing the data content.The Java class library provides the Base64 framework, which can easily perform data encryption and decryption operations.This article will introduce the technical principles of Base64 encryption and provide Java code examples to demonstrate its usage. Technical principle: Base64 encoding is a method based on 64 printed characters (letters, numbers, symbols).It divides the input data into 6 -bit blocks, and is coded by mapping each 6 -bit byte block into a printed character.The specific coding process includes the following steps: 1. Divide the data to be encrypted into a group of byte blocks per 6 bytes. If the last byte block is less than 6 bytes, fill in as needed. 2. Convert each byte block to a binary form and stitch it into a 48 -bit binary string. 3. The 48-bit binary string is divided into 8-bit byte blocks with a group of 6 digits according to 6 bits, and each byte block is taken between 0-63. 4. Map each 6 -bit byte blocks into the corresponding printed character, such as using the character mapping table in the ASCII table. 5. Stimulate the mapped characters into a string, which is the result of the base64 encoding. The decryption process is opposite to encryption, and the Base64 -encoded string is parsed back to the original data. Example code: The following is an example code for data encryption using the Base64 framework in the Java Library: import java.util.Base64; public class Base64EncryptionExample { public static void main(String[] args) { String originalData = "Hello, World!"; // encryption String encryptedData = Base64.getEncoder().encodeToString(originalData.getBytes()); System.out.println ("encrypted data:" + ENCRYPTEDDATA); // Decry byte[] decryptedData = Base64.getDecoder().decode(encryptedData); String decryptedString = new String(decryptedData); System.out.println ("The data after decryption:" + DecryptedString); } } In the above example, we first define a raw data string `Hello, World!Then, we use the `Base64.Getencoder (). Encodetostring () method encrypted the original data and print out the encrypted results.Then, we use the `Base64.getDecoder (). Decode ()` method to decrypt the encrypted data, convert the decrypted result to a string form, and finally print out the decryption result. By running the above code, we can see that the encrypted data is `SGVSBG8SIFDVCMXKIQ ==`, the decrypted data is the same as the original data string. Summarize: Base64 is a data encoding method based on 64 printed characters that can convert data into string containing only ASCII characters to facilitate data transmission and storage.The Base64 framework in the Java library provides convenient and efficient encryption and decryption operations.By using the Base64 framework, we can easily encrypt the data into a string encoded by Base64, and decrypt the encrypted data into the original data.In actual development, Base64 encryption is often used in scenes such as password transmission, data transmission, etc., providing important guarantees for data security.