PHP security protection: Prevent identity forgery attacks

With the continuous development of the Internet, more and more businesses involve online interaction and data transmission, which inevitably causes security issues. One of the most common attack methods is identity forgery attack (Identity Fraud). This article will introduce in detail how to prevent identity forgery attacks in PHP security protection to ensure better system security.

1. What is an identity forgery attack?
   Simply put, an identity forgery attack (Identity Fraud), also known as impersonation, refers to standing in the position of the attacker and falsely claiming to be a legitimate user of the attacked party with a false identity. There are two main purposes: one is to obtain private information, and the other is to obtain data and supply chain resources.
2. PHP Security Protection Strategy
   In order to prevent identity forgery attacks, you need to pay attention to the following points when writing programs.

(1) Session processing security
Session is a lightweight session mechanism in PHP. It can store user login information in Session for subsequent requests and log out when the user logs out. Delete when. An attacker can use cookies to steal session IDs and then use the stolen session IDs to impersonate the user's identity.

In order to enhance the security of the session, the HTTPS protocol should be enabled and SSL/TLS encrypted transmission should be used to solve the security issues caused by clear text transmission of the session ID. In addition, sensitive session information should be salted and hashed so that attackers cannot forge user identities by guessing session IDs.

(2) Prevent SQL injection attacks
SQL injection means that the attacker constructs malicious SQL statements and performs database query or modification operations to achieve the purpose of stealing data or tampering with data.

In order to prevent SQL injection attacks, prepared statements should be used to construct query statements to prevent attackers from mirroring SQL statements by disguising strings as data parameters. At the same time, you should also enable the prepare statement in MySQL and the prepare and bindParam statements of PDO to enhance protection against SQL injection.

(3) Filtering user input
User input is often the most vulnerable factor, so when writing PHP code, effective user input filtering must be performed. Including but not limited to: filtering character sets, filtering special characters, limiting the length of user input, and filtering user-entered tags.

In order to enhance the filtering effect, the HTML Purifier filtering library in PHP should also be combined to filter the HTML data sent by users to avoid being attacked by attackers using XSS attacks.

(4) Cookie security settings
Cookie is a mechanism used by browsers to save user login information. It requires many security settings when writing PHP programs. For example, when setting a cookie, you should set the Expires and Max-Age attributes to specify the expiration time of the cookie to prevent the cookie from becoming an effective proof of the identity of the attacker.

In addition, the cookie content must be encrypted, signed, verified, etc. based on specific business needs to enhance cookie security. Ensure that cookies are only accessed by legitimate users to prevent attackers from using cookies to submit CSRF attacks.

3. Summary
   This article mainly introduces how to prevent identity forgery attacks in PHP security protection, from four aspects: Session security processing, SQL injection prevention, user input filtering and Cookie security settings. Elaborate. Developers should pay attention to security and perform effective verification and filtering when writing PHP code, and avoid loopholes and attack points in the code, so as to ensure the security and stability of the system and provide users with better online experience.

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