Why localstorage is not safe

The reasons why localstorage is unsafe: 1. The storage content can be tampered with; 2. The data can be stolen; 3. The data can be forged; 4. Cross-site scripting attacks; 5. Clear browser data. Detailed introduction: 1. The storage content can be tampered with. The data in localStorage is stored in the user's browser, which means that anyone with access to the browser can view and modify the data in localStorage; 2. The data can be tampered with. is stolen because the data in localStorage is stored by the user and so on.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

The main reasons why localStorage is unsafe are as follows:

1. The storage content can be tampered with: The data in localStorage is stored in the user's browser , which means anyone with access to the browser can view and modify the data in localStorage. Attackers can access and tamper with data in localStorage through various means, such as inserting malicious code, using developer tools, etc.

2. Data can be stolen: Since the data in localStorage is stored in the user's browser, attackers can use various means, such as network packet capture and cookie interception Wait to get this data. This data may contain users' sensitive information, such as usernames, passwords, personal information, etc. Once stolen, the user's privacy and security will be threatened.

3. Data can be forged: An attacker can forge user operations or behaviors by tampering with data in localStorage. For example, an attacker can tamper with the shopping cart data in localStorage into an empty shopping cart, so that users cannot correctly calculate product prices during checkout.

4. Cross-site scripting attack (XSS): An attacker can steal or tamper with the user's localStorage data by inserting malicious scripts into the website. For example, an attacker could insert a malicious script into a website. When a user visits the website, the malicious script will read the user's localStorage data and send it to the attacker's server.

5. Clear browser data: When the user clears browser data, all browser data including localStorage will be cleared. This means that if an attacker has stolen the user's localStorage data, the data will be cleared when the user clears the browser data, making it impossible for the attacker to continue to exploit the data.

In order to improve the security of localStorage, you can take the following measures:

1. Encrypt data: Encrypting the data stored in localStorage can prevent The attacker directly views and modifies the data. Data can be encrypted using various encryption algorithms, such as AES, RSA, etc.

2. Use HTTPS protocol: Using HTTPS protocol can protect the security of data transmission and prevent data from being stolen or tampered with during transmission.

3. Verify data: Verify the data read from localStorage to ensure the integrity and correctness of the data. Data can be verified using various verification methods such as checksums, hashes, etc.

4. Restrict access permissions: Restricting access permissions to localStorage can prevent unauthorized code from accessing and modifying data. Access to localStorage can be restricted using your browser's security policy.

5. Clean data regularly: Regularly cleaning expired data in localStorage can reduce the risk of being exploited by attackers. At the same time, you can also set a reasonable expiration time to prevent long-term stored data from being stolen or tampered with.

6. Prompt users to pay attention to security: Provide users with prompt information about localStorage security so that users can understand how to protect their privacy and security. For example, you can add a message to your website telling users not to use shareable browsers or devices in public to prevent them from being exploited by attackers.

In short, although localStorage has some security issues, its security can be effectively improved by taking some measures. At the same time, users also need to pay attention to protecting their privacy and security and avoid using shareable browsers or devices in public places.

The above is the detailed content of Why localstorage is not safe. For more information, please follow other related articles on the PHP Chinese website!