Encryption App with Type-C Device Integration

Case Study: Encryption App with Type-C Device Integration

In the era of digital information, securing sensitive data has become paramount for individuals and businesses alike. Our client, a provider of cloud-based storage services for photos, documents, and files, identified a unique opportunity to enhance data security through physical means. The aim was to develop an encryption app that ties the security of files stored in the cloud to an external USB device — specifically, a USB-C MicroSD Card Reader designed for encryption and decryption. This case study outlines the journey towards achieving a seamless integration of this encryption mechanism across both Android and iOS platforms, despite the challenges posed by cross-platform development and compatibility issues.


Product Description

The envisioned product was an encryption application capable of binding cloud-stored files to an external USB-C MicroSD Card Reader. This device was not just any storage medium; it was equipped with encryption capabilities, allowing users to encrypt and decrypt files on the go. The key innovation lay in the physical security layer it added to the digital cloud, ensuring that access to sensitive files could be controlled and secured with something tangible. This concept put data security directly into the users’ hands, making it effortless to manage file security anywhere.


Client Challenge

The client’s vision faced significant technical hurdles, primarily due to the need for compatibility across both Android and iOS platforms. The development team utilized Flutter, a popular open-source UI software development kit by Google, for its cross-platform capabilities. However, integrating a physical encryption mechanism with mobile devices presented a unique set of challenges:

    • Cross-Platform Development:

While Flutter allows for code reuse across platforms, accessing hardware-level features such as USB-C connections required platform-specific implementations. This necessitated a deep dive into native development kits for both Android and iOS.

    • iOS Compatibility Issues:

iOS is known for its stringent security measures and limited access to hardware functionalities. The team had to navigate these restrictions to allow the app to communicate with the external USB-C device without compromising the platform’s security standards.



To overcome these challenges and realize the client’s vision, a multi-faceted approach was adopted, comprising the following strategies:

    • Native Integration:

The team developed custom platform-specific code for both Android and iOS. This was essential for handling the hardware interactions between the mobile devices and the USB-C MicroSD Card Reader. For Android, this involved utilizing the USB Host API, while for iOS, the team leveraged the External Accessory framework.

    • Security Protocols:

Implementing encryption and decryption functionalities required a robust security protocol. The app utilized advanced encryption standards (AES) for file encryption, ensuring that files could only be decrypted using the physical USB-C device as a key. This approach not only enhanced security but also ensured compliance with data protection regulations.

    • User Experience (UX) Design:

Recognizing the importance of simplicity and ease of use, especially when dealing with complex security measures, the team focused on creating a user-friendly interface. The app was designed to guide users through the encryption and decryption processes step-by-step, minimizing user error and enhancing the overall experience.

    • Extensive Testing and Compatibility Adjustments:

Rigorous testing was conducted across a wide range of devices and operating systems to ensure compatibility and smooth functionality. This included beta testing with a select user group to identify and rectify potential usability issues, especially concerning iOS’s unique hardware access limitations.



The successful development and deployment of the encryption app with Type-C device integration represented a significant achievement. It allowed the client to offer a novel solution that combined the convenience of cloud storage with the security of physical encryption devices. Key outcomes included:

    • Enhanced Data Security:

Users gained the ability to secure their cloud-stored files with physical keys, significantly reducing the risk of unauthorized access.

    • Cross-Platform Compatibility:

Despite initial challenges, the app provided a seamless experience across both Android and iOS platforms, expanding the product’s market reach.

    • Positive User Feedback:

The intuitive design and robust security features received positive feedback from users, who appreciated the added layer of security for their sensitive data.


This case study illustrates the complexities and innovative solutions involved in developing a cross-platform encryption app integrated with a physical security device. Through strategic planning, custom development, and a focus on user experience, the team successfully navigated the challenges of hardware integration and platform compatibility. The project not only enhanced the client’s product offering but also set a new standard for combining digital and physical security measures in the cloud storage industry.

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