PHP 7 Password Storage Security Guide: How to Encrypt User Passwords Using the argon2i Algorithm

PHP 7 Password Storage Security Guide: How to use the argon2i algorithm to encrypt user passwords

Introduction:
With the development of the Internet, the risk of data leakage and account theft is also increasing. As developers, we have a responsibility to protect the privacy and security of our users. Password storage is a critical issue, and a good password encryption algorithm can provide higher security. In this article, we'll cover how to use the argon2i algorithm in PHP 7 to encrypt user passwords, and provide some code examples to help you achieve more secure password storage.

What is the argon2i algorithm?
argon2i is a cryptographic hash function designed by cryptographers and password storage experts. It was introduced by PHP 7 to provide greater password storage security. The argon2i algorithm is one of the cutting-edge algorithms in the field of password hashing. Compared with previous hashing algorithms, such as MD5 and SHA1, it has higher collision resistance and brute force attack resistance.

Steps to encrypt password using argon2i algorithm:

1. Generate a random salt value.
2. Password hashing using the argon2i algorithm using a salt value and the user-supplied password as input.
3. Storage hash value and salt value.

The following is a code example that uses the argon2i algorithm to encrypt a password:

// 生成盐值
$salt = bin2hex(random_bytes(16));

// 用户提供的密码
$password = $_POST['password'];

// 使用argon2i算法进行密码哈希
$hash = password_hash($password, PASSWORD_ARGON2I, ['salt' => $salt]);

// 存储哈希值和盐值
$hashedPassword = $hash;
$storedSalt = $salt;

Steps to use the argon2i algorithm to verify user passwords:

1. Get the stored hash Greek value and salt value.
2. Password hashing using the argon2i algorithm using a salt value and the user-supplied password as input.
3. Compare the generated hash value with the stored hash value.

The following is a code example that uses the argon2i algorithm to verify user passwords:

// 获取存储的哈希值和盐值
$storedHashedPassword = $row['hashed_password'];
$storedSalt = $row['salt'];

// 用户提供的密码
$password = $_POST['password'];

// 使用盐值和用户提供的密码作为输入，使用argon2i算法进行密码哈希
$generatedHash = password_hash($password, PASSWORD_ARGON2I, ['salt' => $storedSalt]);

// 比较生成的哈希值与存储的哈希值
if ($generatedHash == $storedHashedPassword) {
    // 密码验证通过
    // 执行登录逻辑
} else {
    // 密码验证失败
}

Summary:
Using a secure password storage method is one of the important measures to protect user privacy and security. one. In PHP 7, the argon2i algorithm provides greater password storage security. This article describes how to use the argon2i algorithm to encrypt user passwords and provides corresponding code examples. By following these guidelines, you can improve the security of your application and protect your users' passwords from brute force and collision attacks. Remember, password security is a long-term responsibility, and you should regularly review and update your password storage methods to keep up with evolving security threats.

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