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What is application security?

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Application security describes security measures at the application level that aim to prevent data or code within the app from being stolen or hijacked. It encompasses the security considerations that happen during application development and design, but it also involves systems and approaches to protect apps after they get deployed. 


Application security may include hardware, software, and procedures that identify or minimize security vulnerabilities. A router that prevents anyone from viewing a computer’s IP address from the Internet is a form of hardware application security. But security measures at the application level are also typically built into the software, such as an application firewall that strictly defines what activities are allowed and prohibited. Procedures can entail things like an application security routine that includes protocols such as regular testing. 


Application security definition

Application security is the process of developing, adding, and testing security features within applications to prevent security vulnerabilities against threats such as unauthorized access and modification.


Why application security is important

Application security is important because today’s applications are often available over various networks and connected to the cloud, increasing vulnerabilities to security threats and breaches. There is increasing pressure and incentive to not only ensure security at the network level but also within applications themselves. One reason for this is because hackers are going after apps with their attacks more today than in the past. Application security testing can reveal weaknesses at the application level, helping to prevent these attacks.


Types of application security

Different types of application security features include authentication, authorization, encryption, logging, and application security testing. Developers can also code applications to reduce security vulnerabilities.


Software developers may build authentication and authorization procedures into an application to ensure that only authorized users gain access to it. Authentication procedures ensure that a user is who they say they are. This can be accomplished by requiring the user to provide a user name and password when logging in to an application. Multi-factor authentication requires more than one form of authentication—the factors might include something you know (a password), something you have (a mobile device), and something you are (a thumb print or facial recognition).


After a user has been authenticated, the user may be authorized to access and use the application. The system can validate that a user has permission to access the application by comparing the user’s identity with a list of authorized users. Authentication must happen before authorization so that the application matches only validated user credentials to the authorized user list.


After a user has been authenticated and is using the application, other security measures can protect sensitive data from being seen or even used by a cybercriminal. In cloud-based applications, where traffic containing sensitive data travels between the end user and the cloud, that traffic can be encrypted to keep the data safe. 


Finally, if there is a security breach in an application, logging can help identify who got access to the data and how. Application log files provide a time-stamped record of which aspects of the application were accessed and by whom. Application security testing is necessary to make sure all of these security controls work properly.




Application security in the cloud

Application security in the cloud poses some extra challenges. Because cloud environments provide shared resources, special care must be taken to ensure that users only have access to the data they are authorized to view in their cloud-based applications. Sensitive data is also more vulnerable in cloud-based applications because that data is transmitted across the Internet from the user to the application and back.




Mobile application security

Mobile devices also transmit and receive information across the Internet, as opposed to a private network, making them vulnerable to attack. Enterprises can use virtual private networks (VPNs) to add a layer of mobile application security for employees who log in to applications remotely. IT departments may also decide to vet mobile apps and make sure they conform to company security policies before allowing employees to use them on mobile devices that connect to the corporate network.




Web application security

Web application security applies to web applications—apps or services that users access through a browser interface over the Internet. Because web applications live on remote servers, not locally on user machines, information must be transmitted to and from the user over the Internet. Web application security is of special concern to businesses that host web applications or provide web services. These businesses often choose to protect their network from intrusion with a web application firewall. A web application firewall works by inspecting and, if necessary, blocking data packets that are considered harmful.





What are application security controls? 

Application security controls are techniques to enhance the security of an application at the coding level, making it less vulnerable to threats. Many of these controls deal with how the application responds to unexpected inputs that a cybercriminal might use to exploit a weakness. A programmer can write code for an application in such a way that the programmer has more control over the outcome of these unexpected inputs. Fuzzing is a type of application security testing where developers test the results of unexpected values or inputs to discover which ones cause the application to act in an unexpected way that might open a security hole.




What is application security testing?

Application developers perform application security testing as part of the software development process to ensure there are no security vulnerabilities in a new or updated version of a software application. A security audit can make sure the application is in compliance with a specific set of security criteria. After the application passes the audit, developers must ensure that only authorized users can access it. In penetration testing, a developer thinks like a cybercriminal and looks for ways to break into the application. Penetration testing may include social engineering, or trying to fool users into allowing unauthorized access. Testers commonly administer both unauthenticated security scans and authenticated security scans (as logged-in users) to detect security vulnerabilities that may not show up in both states.  




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