How To Build Your Own File Encryption Software

Are you planning to launch an app that offers your clients access to encrypted data security?

If you are then you are likely wondering how to meet the stringent data privacy regulatory requirements that are legally binding in your home country. The price for data breaches can be high, not to mention the damage to your reputation!

Consequently, you are almost certainly considering encryption. If you are and are wondering how to build your own file encryption software. Help is at hand as I will now explain the basics of how to do that here. Read on!

Contents

Why encryption: the premium on data
What is encryption?
How does encryption work?
Different types of encryption
Encryption and regulation
The market values encryption
Building your own file encryption software

Why encryption: the premium on data

Before we go deeper into encryption, let’s first underline the importance of data. Some observers contend that data is the new oil. There is no doubt that it is the most important commodity in our digital era. Read “The world’s most valuable resource is no longer oil, but data” if you want to learn more about this interesting observation.

A brief glance at world history shows us just how many conflicts took place with the sole objective of grabbing natural resources. It’s no wonder then that similar conflicts are taking place over our data. The armaments in this conflict aren’t weapons in the traditional sense, instead the computer and complex big data analytics have become the main weapons!

Individuals acquire an increasing amount of confidential and sensitive data over the course of their lives. Today, we willingly provide this data to entities including business organizations. We expect them to use it solely for the purposes we authorize them to.

However, as the massive Facebook-Cambridge Analytica data scandal shows, some unethical businesses do misuse our data. Then, there are hackers who just breach security mechanisms, and gain access to our data. What can people do to protect their data? Answer: Encryption.

What is encryption?

Common people need a way to protect their sensitive data even if it falls into unscrupulous hands. If the hackers can’t make any sense of the data, they will not have incentives to steal it in the first place!

Download Our Project Specification Template

Encryption is the technology that turns our sensitive data into scrambled text. The process uses a secret code. Only you, having the secret code to turn that scrambled text back into meaningful information can read your data.

Your data is secure as long as you secure that secret code! Read about it in “Encryption: what it is and why it’s important”. We call the process of converting the scrambled text back to the input data, as “decryption”.

How does encryption work?

Encryption isn’t new. Even ancient civilizations used it, although we wrongly consider their techniques and tools rather primitive now. Modern encryption uses mathematical algorithms. I will explain one such example, although remember that there are many ways to encrypt data.

Let’s review cryptographic hash functions, which are widely used in encryption. It works as follows:

  • An input value is processed through an algorithm.
  • The algorithm converts it into a scrambled text, which we call “hash”.
  • Irrespective of the input value, a cryptographic hash function converts it into a fixed length output.
  • No two input values will have the same hash. Well, at least the probability of this will be truly minuscule!
  • The algorithm works very fast.
  • It’s incredibly difficult to convert the hash back to the input value without knowing the secret code.

A hacker, with access to only the hash value, will find it practically impossible to decipher the input. Read more about this algorithm in “Cryptography hash functions”.

Different types of encryption

There are two types of encryption algorithms, as follows:

Symmetric-key algorithm

The symmetric key algorithm uses the same key for encrypting data as well as decrypting it. The sender of the message shares this key with the recipient. This is a secure algorithm if both parties secure the key, however, if a cyber attacker gets the key then decryption is easy. Examples of this algorithm are as follows:

  • “Format-Preserving Encryption” (FPE), where the input message and the scrambled text have the same format.
  • “Advanced Encryption Standard” (AES) is a form of FPE, with wide popularity.

Read more about it in “Types of encryption: what you need to know about underlying algorithms”.

Asymmetric algorithm

This type of algorithm is also called “Public Key encryption”. It works as follows:

  • There are two keys, namely “Private key”, and “Public key”.
  • Users can share the public key, while they need to guard the private key. Bitcoin uses this type of algorithm.
  • “Rivest-Shamir-Adleman” (RSA) algorithm is an example of the asymmetric type of algorithms. Here, the public and private keys are tied together using integer factorization of very large numbers. Hackers with today’s computers will likely take billions of years to find the private key from the public key. I have explained why in my article “Quantum computing: will it kill blockchain?”.

Encryption and regulation

People and businesses are aware of incidents where hackers have accessed personal sensitive data from some of the big data breaches covered in the news.

These events damage trust and have a serious downstream impact on the world economy. As a result, governments and regulators have responded with stringent regulations with data encryption requirements. I cite two examples, as follows:

These two regulations impact two heavily regulated industries, i.e., healthcare and payment cards. Note that governments and regulators have also enacted regulations for other industries requiring data encryption where data security is paramount.

The market values encryption

Encryption, or “file encryption” as many would call it, is an important building block in an organizations’ information security strategy. Organizations must make considerable efforts to encrypt data in storage and while in transit.

If they are storing sensitive data in the public cloud, they need to encrypt it. Read more about the importance of encryption in “The importance of encryption: some things never change”.

The market certainly gives a “Thumbs Up” to encryption! Globally, the market for encryption software is growing at CAGR of 14%, and it will be a US $ 8.4 billion market by 2024.

Read How We Helped a Marketing Company to Build a Back-Office Custom Ads Dashboard

Read more about in “Encryption software market size, share & trends analysis report by deployment, by application (disk, file/folder, database, web communication, network traffic, cloud), by end-use, and segment forecasts, 2018 – 2024”.

Building your own file encryption software

I will now take you through the steps to create a file encryption app.

Step #1: Project scoping

At first, you need sufficient clarity of your objective, as follows:

  • The objective is to build an app that will encrypt files.
  • You are not trying to create a new encryption algorithm. I have already listed the standard encryption algorithms above.
  • Creating a new encryption algorithm is not about computer application programming, rather it’s about mathematics. You need to have strong mathematics and statistics expertise, moreover, a new encryption algorithm requires stringent review to ensure it will be secure.

Read more about this clarity in this Quora Q&A thread.

Step #2: The development approach

You are likely launching an app to address a business need. Therefore, you are likely to want to focus on the business implementation side of things. As a result, an easy way to incorporate encryption in your app is a must!

I recommend you use the “Amazon Web Services” (AWS) encryption “Software Development Kit” (SDK). This enables you to implement encryption easily in your app. Read “What is the AWS encryption SDK?” for more details.

Step #3: Form a development team

Assuming you will create an Android app and a web app, you will need the following skills in your team:

  • Business analysts;
  • UI/UX design;
  • Android developers;
  • Web developers;
  • Testers;
  • A project manager (PM).

Web and mobile apps are “Systems of Engagement” (SoEs), therefore, iterative development is appropriate. Agile methodology supports iterative development. I recommend Agile software development for this project. Read “How to build an Agile development team?” for more insights.

Step #4: Provision a “Platform as a Service” (PaaS) for the web app

I recommend that you use AWS Elastic Beanstalk for your web app. This is the “Platform as a Service” (PaaS) offering of AWS. You have the following advantages with this approach:

  • AWS encryption SDK works seamlessly with AWS cloud platforms.
  • You can focus on the software development, while AWS Elastic Beanstalk addresses the cloud infrastructure, networking, servers, middleware, operating system (OS), runtime environment, database, and 3rd party API integration.

Step #5: “Mobile Backend as a Service” (MBaaS) provisioning for the mobile app

You will need to provision a “Mobile Backend as a Service” (MBaaS) for the Android app. I recommend AWS Amplify, i.e., the MBaaS offering from AWS. You can focus on the mobile front-end design and development, while AWS Amplify offers the following advantages:

  • It handles the cloud infrastructure, persistent storage, database, user management, push notifications, security, and 3rd party API integration.
  • You can easily integrate the AWS encryption SDK.

Step #6: Use AWS encryption SDK in your web and Android apps

AWS encryption SDK offers the following features and advantages:

  • It uses symmetric-key encryption. More specifically, it makes use of envelope encryption, where a master key further protects the data key for encryption. You can read more about it in “How the AWS encryption SDK works”.
  • Since it uses the AES algorithm with up to 256-bit encryption keys, you have the assurance that your web and mobile apps are using industry-standard encryption techniques.
  • AWS encryption SDK is easy to use. You can use your AWS account, which you are using for AWS Elastic Beanstalk and AWS Amplify anyway. A “Customer Master Key” (CMK) is needed, moreover, you need to create a user with an access key. You need to set your AWS credentials. Read “Getting started with the AWS encryption SDK” for more details.
  • The SDK is available for Java and Python. For this project, you will need to use Java SDK. Visit “AWS encryption SDK for Java” for installation instructions.
  • As with other AWS products, you have excellent documentation for AWS encryption SDK. Visit their “Frequently asked questions” (FAQ) page.

Step #7: Use AWS Elastic Beanstalk Java runtime for the web app

I recommend you use Java for creating your web app with file encryption on AWS Elastic Beanstalk. Read “Creating and deploying Java applications on AWS Elastic Beanstalk” for detailed instructions. Integration with the AWS encryption Java SDK will be easy.

Step #8: Use DevOps tools for the web app

Use an appropriate DevOps tool suite for the web app, due to the following reasons:

  • This will help in automated testing, build management, and deployment.
  • Iterative development requires this “Continuous Integration” (CI).

I recommend you use the AWS DevOps tool suite. Read “DevOps and AWS” for more information.

Step #9: Use Android Studio for the mobile app

Use appropriate tools and guidelines for the Android app development, as follows:

  • Android Studio as the “Integrated Development Environment” (IDE) enables you to code, test, and deploy easily.
  • You will need to code in Java so that you can easily integrate the AWS encryption Java SDK. This guide provides instructions on how to code using Java in Android Studio.
  • Read this guideline for deploying your Android app on “Google Play”.

Step #10: Use the “Scrum” technique for project management

Consider using the “Scrum” technique to manage this app development software project. A part of the Agile methodology, it works as follows:

  • A cross-functional project team consisting of designers, developers, testers, and other roles takes the project forward. We call it the “Scrum team”, with the PM working as the “Scrum master”.
  • “Product owners” provide the requirements or features in a document that we call the “Product Backlog”.
  • Upon estimating, the team slots these into various “Sprints” according to the priority. “Sprints” are the iterations.
  • The team uses a set of meetings, for e.g., “Daily stand-up meeting” for status reporting, “Sprint review meeting” for gaining the project stakeholders’ approval, and “Sprint retrospective meeting” for learning lessons.

Read “How to build a Scrum development team?” for insights into “Scrum”. Use a robust PM tool. Trello is a good option for Agile projects, however, our guide “The 10 best Agile project management tools in 2018” has more options.

Planning for an app for a heavily regulated industry?

Are you planning to create an app for an industry with heavy data privacy regulatory requirements?

If so, you are going to need to build the app with sufficiently strong encryption technology. Such a project can become complex, therefore, consider engaging a professional development partner. Our guide “How to find the best software development company?” can help you find the right development partner.

Download Our Project Specification Template

Aran Davies

Blockchain Expert | Developer | Writer | Photographer
Aran Davies

Latest posts by Aran Davies (see all)