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What are the best practices for securing iOS apps?

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iOS apps are widely used and trusted by millions of users, but they also face various security threats and challenges. To protect your app and your users from hackers, malware, data breaches, and other risks, you need to follow some best practices for securing iOS apps. In this article, you will learn about six key aspects of iOS app security and how to implement them in your development process.

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Surojit Bhattacharya

Android | iOS | Mobile | UWP Apps | Mobility | EAM | ERP | Software Engineer
Alex Nadiein

Senior iOS Engineer | Mobile Development Leader | ML Enthusiast
Zohrab Taghiyev

Certified iOS Developer | Content Creator

1 Use HTTPS and SSL

The first and most basic practice for securing iOS apps is to use HTTPS and SSL for all network communications. HTTPS is a protocol that encrypts the data exchanged between your app and the server, while SSL is a certificate that verifies the identity and authenticity of the server. By using HTTPS and SSL, you can prevent man-in-the-middle attacks, eavesdropping, and tampering of your app data. To use HTTPS and SSL in your iOS app, you need to configure your app transport security (ATS) settings in your Info.plist file and obtain a valid SSL certificate from a trusted authority.

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Surojit Bhattacharya

Android | iOS | Mobile | UWP Apps | Mobility | EAM | ERP | Software Engineer
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Yes, it is recommended to use HTTPS and SSL for all network communication. However, if you support a product where customers can use their self-signed certificates on an on-premise server, then you need to also support untrusted certificates. In such cases, it is essential to prompt the user with a warning indicating that the certificate is untrusted. Remember that supporting untrusted certificates is a significant security concern. If you scan your app using any penetration security portal, you will likely find numerous high-priority issues related to untrusted security. Therefore, using HTTPS or SSL is unquestionably important.

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2 Encrypt sensitive data

Another practice for securing iOS apps is to encrypt sensitive data that your app stores or handles, such as user credentials, personal information, payment details, and so on. Encryption is a process that transforms data into an unreadable format using a secret key, making it harder for hackers to access or misuse it. To encrypt data in your iOS app, you can use various methods and tools, such as the Keychain API, the Data Protection API, the CommonCrypto library, or third-party encryption frameworks.

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Alex Nadiein

Senior iOS Engineer | Mobile Development Leader | ML Enthusiast
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Certain types of data demand extra protection, such as medical records. Numerous regulations, like HIPAA, mandate encrypted storage. I typically employ third-party encryption tools, such as Themis by Cossack Labs.

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3 Implement authentication and authorization

Authentication and authorization are two related but distinct concepts that help secure iOS apps by controlling who can access your app and what they can do with it. Authentication is the process of verifying the identity of a user, while authorization is the process of granting or denying permissions to a user based on their role or status. To implement authentication and authorization in your iOS app, you can use various techniques and features, such as biometric authentication, password policies, OAuth 2.0, JWT tokens, Firebase Authentication, or Apple Sign In.

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4 Use code obfuscation and encryption

Code obfuscation and encryption are two techniques that help secure iOS apps by making your app code more difficult to read, analyze, or reverse engineer. Code obfuscation is the process of changing the names and structure of your code elements, such as variables, functions, classes, or methods, to make them less meaningful or recognizable. Code encryption is the process of encrypting your code files or segments using a secret key, making them unreadable without the key. To use code obfuscation and encryption in your iOS app, you can use various tools and frameworks, such as SwiftShield, iXGuard, or SecureSWIFT.

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Alex Nadiein

Senior iOS Engineer | Mobile Development Leader | ML Enthusiast
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Furthermore, avoid storing API keys, tokens, or passwords in your source code. If you must, employ tools like git-crypt to store them securely encrypted.

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5 Test and update your app regularly

Testing and updating your app regularly are two practices that help secure iOS apps by detecting and fixing any security vulnerabilities or bugs that may arise in your app. Testing is the process of checking your app for any errors, flaws, or weaknesses that may compromise its functionality or security. Updating is the process of releasing new versions of your app that include improvements, enhancements, or patches for any issues that were found during testing. To test and update your app regularly, you can use various tools and services, such as Xcode, TestFlight, Firebase Crashlytics, or App Store Connect.

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Alex Nadiein

Senior iOS Engineer | Mobile Development Leader | ML Enthusiast
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If you're using third-party libraries in your app, don't forget to test them for vulnerabilities. There are plenty of tools available for static code analysis and network monitoring.

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6 Follow the App Store Review Guidelines

The last but not least practice for securing iOS apps is to follow the App Store Review Guidelines, which are a set of rules and standards that Apple requires all iOS apps to comply with before they can be published on the App Store. The App Store Review Guidelines cover various aspects of app quality, performance, design, functionality, and security, and they are updated frequently to reflect the latest best practices and technologies. By following the App Store Review Guidelines, you can ensure that your app meets the expectations and requirements of Apple and your users, and that it does not contain any malicious or harmful code or content.

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7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

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Zohrab Taghiyev

Certified iOS Developer | Content Creator
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Implement Two-Factor Authentication (2FA) Two-factor authentication adds an extra layer of security by requiring users to provide two forms of authentication before gaining access to their accounts or sensitive information within the app. Typically, this involves something the user knows (e.g., a password) and something the user has (e.g., a one-time code sent to their mobile device). Implementing 2FA in your app enhances user account security and helps prevent unauthorized access, even if login credentials are compromised.

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What are the best practices for securing iOS apps?

1

2

3

4

5

6

7

1 Use HTTPS and SSL

2 Encrypt sensitive data

3 Implement authentication and authorization

4 Use code obfuscation and encryption

5 Test and update your app regularly

6 Follow the App Store Review Guidelines

7 Here’s what else to consider

Mobile Applications

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What are the best practices for securing iOS apps?

1

2

3

4

5

6

7

1 Use HTTPS and SSL

2 Encrypt sensitive data

3 Implement authentication and authorization

4 Use code obfuscation and encryption

5 Test and update your app regularly

6 Follow the App Store Review Guidelines

7 Here’s what else to consider

Mobile Applications

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