Security Testing Tools

1) Burp Suite Community Version.

2) OWASP ZAP

3) SSLScanner

4) Dirbuster

5) Nikto

6) Nmap

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Find Loop in a Linked List

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 Problem Statement In this problem, we are given a linked list with a loop. We have to find the first node of the loop in the linked list. Problem Statement Understanding Let’s try to understand the problem statement with the help of examples. Suppose the given list is: According to the problem statement, we need to find the starting node of the loop. From the linked list, we can see that there is a loop in the linked list starting at node with value 3 and containing 3 nodes 3, 5, and 7. The last node of the loop points back to the first node of the loop. As node with value 3 is the first node of the loop, so we will return 3 as output. Approach and Algorithm (Floyd’s Cycle Detection) Our approach will be simple: 1) Firstly, we have to detect the loop in the given linked list. For detecting a loop in any linked list, we know the most efficient algorithm is the  Floyd Cycle detection Algorithm . 2) In Floyd's cycle detection algorithm, we initialize 2 pointers,  slow ...
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Optional Vs Null Check

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The purpose of Optional is not to replace every single null reference in your codebase but rather to help design better APIs in which—just by reading the signature of a method—users can tell whether to expect an optional value. In addition, Optional forces you to actively unwrap an Optional to deal with the absence of a value; as a result, you protect your code against unintended null pointer exceptions. String version = computer.getSoundcard().getUSB().getVersion(); This code can lead to NullPointerException. Handle NullPointerException - This code looks ugly. String version = "UNKNOWN"; if(computer != null){   Soundcard soundcard = computer.getSoundcard();   if(soundcard != null){     USB usb = soundcard.getUSB();     if(usb != null){       version = usb.getVersion();     }   } } String name = computer.flatMap(Computer::getSoundcard)                           .f...
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Caching

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What is a cache? A cache is a component that stores portions of data that would otherwise either take a long time to calculate/process. Caches may also originate from another underlying backend system, where caching is used to prevent additional requests for round trips for frequently used data. Caching can be used to improve performance or reduce application latencies in both these cases. A cache hit means the data required for the request is in the cache and is served from the cache. A cache miss means the data required for the request is not in the cache and would need to be computed by the backend systems.  Why we should cache?? 1) Reduce network calls. (Store data in cache and return that data to user instead to hit the DB) 2) Avoid repeated computations. (Suppose we want average age of employees, its a costly operation, we should store it in cache) 3) Reduce DB load. 4) Increase the response time. Cache Policy -  When I have to add data ad when we have to evict the data...
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