How to Write a Simple Linux Bash Honeypot

The first step in a malicious hacker attack is scanning. This means that an attacker will scan its target for open ports and vulnerabilities. So, the best approach is to block an attacker who tries to do such a scan in the very beginning. Here is a fast and easy way how to do this…. read more »

How to Prevent Resources From Leaking in Java

In Java, a resource leak occurs when a program fails to properly release system resources after they are no longer needed. This can lead to a range of problems, such as reduced system performance, increased memory usage, and potential security vulnerabilities. System resources include things like file handles, network sockets, database connections, and other resources… read more »

Reasons to Make Methods Final in Java

Making methods final in Java can provide several benefits, including: However, it’s important to note that marking methods final is not always necessary or appropriate. It should only be used when it makes sense for the specific use case and design of the code. Additionally, marking a method final can limit the flexibility and extensibility… read more »

Security Risks of Serializing and Deserializing Data in Java

Serializing and deserializing data in Java can introduce several security risks if not implemented properly. Here are some of the main risks: To mitigate these risks, it’s important to follow best practices when serializing and deserializing data in Java. These include: By following these best practices, you can help ensure that your Java applications are… read more »

How to Improve Security and Performance in Java with PreparedStatement

In Java, a PreparedStatement is a feature of the JDBC API that allows you to execute parameterized SQL statements. A PreparedStatement is a precompiled SQL statement that can be executed multiple times with different parameters, which makes it more efficient than creating a new Statement object for each execution. To use a PreparedStatement, you first… read more »

What are Java’s Access Modifiers and How to Use Them

In Java, access modifiers are keywords that determine the accessibility of classes, methods, and variables in an object-oriented program. There are four access modifiers in Java: Access modifiers are used to control the level of encapsulation of an object-oriented program and to restrict access to sensitive or implementation-specific details of the program. Here are some… read more »

Common Mistakes Which Leave a Linux Vulnerable

Securing a Linux system can be a complex task, and there are many potential pitfalls and mistakes that can compromise the system’s security. Here are some of the most common mistakes with examples: To improve the security of a Linux system, here are some best practices that you should follow: In summary, securing a Linux… read more »

When and How to Use Iptables and Ipsets

iptables and ipsets are both tools that are commonly used in Linux-based operating systems for managing network traffic. However, they serve different purposes and have different capabilities. iptables is a firewall tool that allows you to configure rules for filtering and manipulating network traffic. It uses a set of predefined chains (INPUT, OUTPUT, and FORWARD)… read more »

How to Develop Securely In Java

There are several good security practices to follow when developing Java applications. Here are some of the most important ones: By following these best practices, you can help ensure the security of your Java applications and protect against common security threats.

How to Protect the Class State from Unintended Changes in Java

In Java, objects can be classified as either mutable or immutable based on whether their state can be changed or not. A mutable object is one whose state can be modified after its creation. For example, an array can have its elements added, removed or modified after it has been created. On the other hand,… read more »