Replay attack
A replay attack, sometimes called a demonstration attack, is where an attacker replays data previously sent by a legitimate user to the server to gain access or other rights assigned to that user.
Like password sniffing, preventing replay attacks requires you to be aware of data exposure. To prevent replay attacks, you need to make it more difficult for an attacker to obtain any data used to gain access to restricted resources. This mainly requires avoiding the following practices:
Setting the use of data with permanent access to protected resources;
Setting protected Exposure of data that provides access to resources (even data that only provides temporary access);
In this way, you should only use data that establishes temporary access to protected resources, and you should also try to avoid leaks of this data. These are just general guidelines, but they can provide guidance on how you operate.
The first principle is, as far as I know, violated with frightening frequency. Many developers focus only on protecting sensitive data from exposure and ignore the risks that arise when the data used to set permanent access to protected resources is used.
For example, consider a local script that calculates a hash of a password for a form validation form. In this way, the plaintext of the password will not be exposed, only its hash value will be exposed. This protects the user's original password. The main problem with this process is that the replay vulnerability remains the same - an attacker can simply replay the legitimate authentication process once and pass the authentication, and as long as the user's password is consistent, the authentication process will succeed.
For more secure operation solutions, MD5 JavaScript source files and other algorithms, please see http://www.php.cn /.
A similar violation of the first principle is specifying a cookie to provide permanent access to a resource. For example, consider the following attempt to run a persistent access mechanism by setting a cookie:
CODE: <?php $auth = $username . md5($password); setcookie('auth', $cookie); ?>
If an Authenticating the user provides an authentication cookie, and the program checks to see if the hash of the password in the cookie matches the hash of the password stored in the database. If they match, the user is authenticated.
The problem with this process is that exposure of the authentication cookie is a very large risk. If it is captured, the attacker gains permanent access. While a legitimate user's cookie may expire, an attacker can provide the cookie for authentication every time. See Figure 7-2 for an illustration of this situation.
A better permanent login solution is to only use the data to set temporary access rights, which is also the topic of the next section.
The above is the content of PHP security-replay attack. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

In PHP, use the clone keyword to create a copy of the object and customize the cloning behavior through the \_\_clone magic method. 1. Use the clone keyword to make a shallow copy, cloning the object's properties but not the object's properties. 2. The \_\_clone method can deeply copy nested objects to avoid shallow copying problems. 3. Pay attention to avoid circular references and performance problems in cloning, and optimize cloning operations to improve efficiency.

PHP is suitable for web development and content management systems, and Python is suitable for data science, machine learning and automation scripts. 1.PHP performs well in building fast and scalable websites and applications and is commonly used in CMS such as WordPress. 2. Python has performed outstandingly in the fields of data science and machine learning, with rich libraries such as NumPy and TensorFlow.


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