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Generating License Keys in How to implement a modern license key algorithm. Generating and validating license keys is a common requirement for commercial desktop applications. This article shows a state of the art implementation in It is simple and cryptographically secure. Scope When you browse StackOverflow for licensing implementations, you frequently read the following warning: It is true.

So, given that our task is ultimately impossible, we don’t want to think about it for too long. At the same time, we want something that is reasonably safe.

This article is about registration codes that work offline. No phoning home to a license server. Even if you use a server, you likely don’t want your app to stop working just because your user doesn’t have internet for a brief while.

To achieve this, you will need an offline way of validating licenses. Cracks vs. The most common are cracks. These usually patch your application’s executable, to trick it into believing that there is a valid license. Every desktop application can be fooled in this way. Fortunately, cracks usually only work for specific versions of an app eg. The worst case for software vendors are key generators. They can be used to create arbitrarily many valid serial numbers.

If a keygen exists for your app, then your licensing algorithm is compromised beyond repair. Partial key verification To prevent keygens from working for all versions of your software, a commonly used technique is partial key verification. Under this scheme, you only use some bits to check the validity of a license key.

For example, the first version of your app might only check the first character in each group of a product key: But it doesn’t prevent other keygens from appearing for your new app version. Key length Historically, license keys had to be entered manually.

Nowadays, hardly anyone types in license keys by hand. When a user purchases your software, you send them an email. Because of this, the length of license keys has little practical relevance today. Older articles about license verification spend a lot of brainpower on 1 encoding information in the limited-length license key, such as a maximum app version, and 2 on partial key verification. If we drop the requirement that license keys be easy to type, we can get a simpler and more secure solution.

A modern approach At the end of the day, a license check boils down to code like the following: For example, say your app’s binary is encrypted and only valid license keys can “decrypt” it somehow. Fortunately, modern cryptography gives us just the right tool for this: We can use RSA signature verification to sign the licensing data with a private key, then verify the signature with an associated public key.

Below is an example in Python that uses the rsa library. Because RSA is so ubiquitous, you should be able to easily port this to another language if required. First, create an RSA key pair on your development machine. We use bits here because it leads to shorter signatures.

In practice, you probably want bits or more. Then, in your application, check the validity of the license key as follows: This lets you include information relevant to licensing in the data, such as a maximum app version to which your user is entitled. The above code works as-is when you type it into one interactive Python interpreter session. In practice, you will have to ship the public key with your app and decide where the user will put the license key. These are just details however.

The important parts of the implementation are all here. It is not immune to cracking however — as mentioned above, no desktop app is. If you want to make your app even more secure, you could look at obfuscation. This makes reverse-engineering and thus circumventing your copy protection more difficult.

Michael is the creator of fman , a cross-platform file manager. Frustrated with how difficult it was to create this desktop application, Michael open sourced fman’s build system fbs.

A few days of these months come from using fbs’s well-integrated licensing implementation.

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Generating License Keys in 2019

Generating License Keys in How to implement a modern license key algorithm. Generating and validating license keys is a common requirement for commercial desktop applications. This article shows a state of the art implementation in It is simple and cryptographically secure. Scope When you browse StackOverflow for licensing implementations, you frequently read the following warning:

Cracks vs. keygens

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