What are the best app development companies in India?

Application Development includes research, new development, modifications, reuse, re- engineering, maintenance or any other activity that results in the finished application. As market changes, the way we do our business and spending on IT activities of our business also changes. This dynamic change not only creates pressure but also open the doors to new opportunities. Therefore today, IT giants must stay on the cutting edge of providing complex solutions with less time-to-market in an affordable manner to its customers.

iFour Technolab Pvt Ltd helps organizations to effectively manage their applications through customized solutions. We provide value to our clients by leveraging our techniques and practices to satisfy our customers’ requirements.
Some of our value adding features in our services is:

• Domain Knowledge: Our deep industry knowledge and technical expertise to deliver effective results. We provide services to reduce costs and increase productivity.
• Customized Application: Customized solutions to support individual business needs. We develop applications that are scalable, secure and easily maintainable.
• Application Maintenance Support: We ensure that our applications are working effectively and efficiently supporting all business requirements. We offer continuous maintenance and support services to ensure long term value adding to our customers.

iFour Technolab Pvt. Ltd. provides application development services in India for various platforms like web, desktop and mobile that includes iOS, Android and Windows mobile. We understand the importance of technology and platform selection and conduct a special walkthrough with customer to discuss and select the right technology platform that suits your requirement and IT infrastructure. We use cutting edge technology for application development and ensure that it is in sync with your IT infrastructure.  Throughout the project lifecycle our focus is on the organization and providing measurable results.

Types of Network Security

Network scanning is a scanning used to define vulnerabilities in a network. A scan can be used by security experts to shield the security of a network from an external attack. Hackers may use a scan to find vulnerabilities. Different types of scanning are as under,

Three–Way Handshake

TCP is connection-oriented, which indicates connection establishment is principal prior to data transmission between applications. This connection is possible using the process of the three-way handshake. The three-way handshake is applied for establishing the connection between protocols.

The three-way handshake procedure goes as follows:

• To launch a TCP link, the source sends a SYN packet to the destination (10.0.0.3:21).
• The destination, on getting the SYN packet, i.e., sent by the source, responds by referring a SYN/ACK packet back to the source.
• This ACK packet checks the arrival of the first SYN packet to the source.
• The source sends an ACK packet for the ACK/SYN packet sent by the receiver.
• This triggers an "OPEN" connection agreeing communication between the source and the destination, until any of them send a "FIN" packet or a "RST" packet to close the connection.

The TCP protocol keeps stateful connections for all connection-oriented protocols across
the Internet, and works the same as a normal telephone communication, in which one picks up a telephone receiver, hears a dial tone, and dials a number that generates ringing at the receiver end until a person picks up the receiver and tells, "Hello."

Stealth Scan(Half-Open Scan)

Stealth scan sends a single frame to a TCP port without any TCP handshaking or extra packet transfers. This is a scan type that leads a single frame with the expectation of a single response. The half-open scan partly opens a connection, but stops midway. This is also known as a SYN scan because it only directs the SYN packet. This stops the service from ever being reported of the incoming connection. The three-way handshake approach is also implemented by the stealth scan. The variation is that in the last stage, remote ports are recognized by examining the packets entering the interface and dismissing the connection before a new initialization was activated.

The process preludes the following:

• To start initialization, the client forward a single "SYN" packet to the destination server on the matching port.
• The server initiates the stealth scanning process, depending on the response sent.
• If the server forwards a "SYN/ACK" response packet, then the port is in "OPEN" state.
• If the response is advanced with an "RST" packet, then the port is in a "CLOSED" state.

NULL Scan

NULL scans direct TCP packets with all flags turned off. It is expected that closed ports will return a TCP RST. Packets received by open ports are rejected as invalid. It sets all flags of TCP headers, such as SYN, ACK, FIN, RST, URG and PSH, to NULL or unassigned. When any packets reach at the server, BSD networking code notifies the kernel to drop the incoming packet if a port is open, or sends an RST flag if a port is closed. This scan uses flags in the opposite fashion as the Xmas scan, but gives the similar output as FIN and Xmas tree scans. Many network codes of major operating systems can behave inversely in terms of responding to the packet, ex, Microsoft versus UNIX. This method does not helpful for Microsoft operating systems. Command line for null scanning with NMAP is " -sN"
Advantage:
It evades IDS and TCP three-way handshake.
Disadvantage:
It is helpful only for UNIX.

Network scanning scans networks for vulnerabilities in the security of that network. If there is a vulnerability with the safety of the network, it will give a report back to a hacker who may use this information to exploit that network bug to gain entry to the network or for other malicious actions.

Automated Software Testing and related Tools

Software testing is major part of software development life cycle in all the software development companies. There are so many methods for software testing. One method is automated software testing. The objective of automated testing is to simplify testing using minimum scripts. It uses automated software tools to run tests based on predetermined algorithms to compare the developing program’s expected outcome with the actual outcome. If both the outcomes are aligned the program is running properly otherwise there is need for improvement. If two programs are not aligned with each other you have to do changes in the code and test it again until the outcomes align.

Automated testing is best to use when you’re working on a large project, and when there are many system users. Advantages of automated testing, for the custom software development companies, are its relative quickness and effectiveness. You have to set up initial test then it’s an easy process to repeat tests, continuously fill out the same information and everything is done for you automatically.

Many open source automation testing tools are available for almost all types of testing such as functional, Web, UAT, regression, performance etc. There are several criteria’s based on which a custom software development company can select tool for doing automated testing. Those are:-

• Target Testing Team
• Application & Platform support
• Testing Types
• Programming ability
• Application Technology
• Test Data Sources
• Testing Tools Outputs
• Technical Support
• Pricing Policy

Some of the tools that can be used for doing the automated testing are:

1. Silenium

Selenium is the best option for automated testing of Websites today. It is becoming popular and it is the first choice of automation testers as well as custom software development organizations for automating the testing of Web-based applications for both the GUI as well as the functionality. It  can also be used as a unit testing tool for JavaScript. Silenium  is package of various test components.  Selenium has following three modes for executing the test cases and test suites: Record-Playback mode (Selenium IDE)‏, Selenium Remote Control (RC) Mode, Test Runner Mode.

2. Watir

Watir is a set of Ruby libraries for automating web browsers. It  allows to write tests that are easy to read and maintain. It drives browsers the same way people do and also checks results such as whether expected text appears on the page. It is open source.

3. Windmill

Windmill is web application testing tool.  It supports cross-browser test recorder, JavaScript integration and an interactive shell to automate web browsers. It is open source.

4. SoapUI

SoapUI is a tool for automation of web application testing. SoapUI is available as a free open source edition as well as a commercial Pro edition.

5. Tellurium

Tellurium is a web automation tool that allows you to design and write your automated tests using plain English without any scripting or programming experience. It has a full library of “Plain English” commands – plus the ability to create your own – Tellurium’s natural language makes it easy for everyone to read and write advanced automated tests. No programming experience is required.

6. QTP

HP QTP uses Visual Basic Scripting  for automating the applications. Scripting Engine is available as a part of the Windows OS thus it is not installed exclusively.

Thus, for doing automated testing, a custom software development company have to analyse each tool in detail and as per requirement you have to choose best tool which fulfils all the criteria.

            

 Author Signature - Venu Majmudar