PHP user password encryption algorithm analysis
Common encryption algorithms can be divided into three categories, symmetric encryption algorithms, asymmetric encryption algorithms and Hash algorithms.
Symmetric encryption
refers to an encryption algorithm that uses the same key for encryption and decryption. The advantages of symmetric encryption algorithms lie in the high speed of encryption and decryption and the difficulty in cracking when using long keys. Assuming that two users need to use symmetric encryption method to encrypt and then exchange data, the users need at least 2 keys and exchange them. If there are n users in the enterprise, the entire enterprise will need a total of n×(n-1) keys. The generation and distribution of keys will become a nightmare for enterprise information departments. The security of the symmetric encryption algorithm depends on the storage of the encryption key, but it is impossible to require everyone in the enterprise who holds the key to keep the secret secret. They usually secrete the key intentionally or unintentionally. Leakage - If the key used by a user is obtained by an intruder, the intruder can read all the documents encrypted by the user's key. If the entire enterprise shares an encryption key, the confidentiality of the entire enterprise's documents will be lost. Talk about.
Common symmetric encryption algorithms: DES, 3DES, DESX, Blowfish, IDEA, RC4, RC5, RC6 and AES
This article mainly introduces the PHP user password encryption algorithm, which is more detailed The principle of the Discuz encryption algorithm is analyzed, and the implementation method of the .net algorithm is compared with the example form, and the process and implementation method of user encryption in PHP are summarized. Friends in need can refer to the password of
Discuz The encryption algorithm is actually two MD5 encryptions. First, encrypt with plain text, then randomly generate a salt, and then add salt after the first cipher text as plain text and perform MD5 encryption again. The salt is stored in the uc_members table and can be obtained by user name.
Like this:
MD5(MD5(plaintext)+salt)
The following is the implementation code of .net:
string GetDiscuzPWString(string sourceStr, string salt)
{
return GetMd5Hash(string.Concat(GetMd5Hash(sourceStr),salt));
}
string GetMd5Hash(string input)
{
MD5 md5Hasher = MD5.Create();
byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(input));
StringBuilder sBuilder = new StringBuilder();
for (int i = 0; i < data.Length; i++)
{
sBuilder.Append(data[i].ToString("x2"));
}
return sBuilder.ToString();
}Summary of the password judgment method:
① To installUC
② Open the database and find the uc_members table, and look for the last A field "salt", copy the value inside
③ Pseudo code:
$s=md5(md5("密码")."salt字段的值");
echo $s;④ Use IF to judge
⑤ Say it again! That random number is 6 digits!
The above is the detailed content of PHP user password encryption algorithm analysis. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
Hot Article
Hot Tools
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
PHP 8.4 Installation and Upgrade guide for Ubuntu and Debian
Dec 24, 2024 pm 04:42 PM
PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati
7 PHP Functions I Regret I Didn't Know Before
Nov 13, 2024 am 09:42 AM
If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op
How To Set Up Visual Studio Code (VS Code) for PHP Development
Dec 20, 2024 am 11:31 AM
Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c
Explain JSON Web Tokens (JWT) and their use case in PHP APIs.
Apr 05, 2025 am 12:04 AM
JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,
PHP Program to Count Vowels in a String
Feb 07, 2025 pm 12:12 PM
A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total
How do you parse and process HTML/XML in PHP?
Feb 07, 2025 am 11:57 AM
This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an
Explain late static binding in PHP (static::).
Apr 03, 2025 am 12:04 AM
Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.
What are PHP magic methods (__construct, __destruct, __call, __get, __set, etc.) and provide use cases?
Apr 03, 2025 am 12:03 AM
What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
