4-Net 2.0 serial key or number

4-Net 2.0 serial key or number

4-Net 2.0 serial key or number

4-Net 2.0 serial key or number

Generating License Keys in

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:

No license scheme is % secure.

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. keygens

There are several ways in which people can work around the copy protection in your software. 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. but not ).

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:

TEM8S2-2ETCGKP1-DPSI2-EPZO1

If someone publishes a keygen for your app, then you can release a new version that checks the second character (say) for a different requirement:

TEM8SETCGKP1-DPSI2-EPZO1

This limits the potential damage of a single key generator. But it doesn't prevent other keygens from appearing for your new app version.

Key length

Historically, license keys had to be entered manually. For instance, when you bought Windows XP, you received a CD-ROM and a printed product key that you had to type in upon installation:

To make this workable, license keys had to be short and consist of simple characters such as A - Z and 0 - 9.

Nowadays, hardly anyone types in license keys by hand. When a user purchases your software, you send them an email. They either download the license key, or copy/paste it into your application. 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:

if license_key_is_valid(): # start the application else: # alert user

Note that this even applies to more exotic solutions. For example, say your app's binary is encrypted and only valid license keys can "decrypt" it somehow. Then amounts to asking "can this key be used to decrypt the binary?".

We thus need to choose an implementation for . 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.

import rsa pubkey, privkey = www.globaltradematters.orgs()

When a user purchases, generate a license key:

data = 'user@www.globaltradematters.org' signature = www.globaltradematters.org(www.globaltradematters.org('utf-8'), privkey, 'SHA-1') from base64 import b64encode print(data + '\n' + b64encode(signature).decode('ascii'))

This prints the following:

user@www.globaltradematters.org ejp2RYhgI5p43n80BBCk32umDmqoezLkfOJmqIgNvHfux9Wm8bYtZJIAciet/Ef0ORo49JHr6zYwnTq6g7w==

Send this to your user. Then, in your application, check the validity of the license key as follows:

try: www.globaltradematters.org(www.globaltradematters.org('utf-8'), signature, pubkey) except www.globaltradematters.orgcationError: # invalid license key - refuse to start else: # start application

Once execution reaches the last line, you can trust that was not tampered with. 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.

Caveats & Summary

Assuming you use a large enough bit size, the above implementation should be safe from key generators. 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). It saves you months when creating desktop apps with Python and Qt. A few days of these months come from using fbs's well-integrated licensing implementation.

Источник: [www.globaltradematters.org]
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4-Net 2.0 serial key or number

.NET profile support

Referencing additional class library assemblies

Unity supports a number of .NET profiles. Each profile provides a different API surface for C# code which interacts with the .NET class libraries. You can change the .NET Profile in the Player settings (go to Edit > Project SettingsA broad collection of settings which allow you to configure how Physics, Audio, Networking, Graphics, Input and many other areas of your Project behave. More info
See in Glossary, then select the Player category) using the Api Compatibility Level option in the Other Settings panel.

Legacy scripting runtime

The legacy scripting runtime supports two different profiles: .NET Subset and .NET Both of these are closely aligned with the .NET profile from Microsoft. The .NET Subset profile is smaller than the .NET 4.x profile, and it allows access to the class library APIs that most Unity projects use. It is the ideal choice for size-constrained platforms, such as mobile, and it provides a set of portable APIs for multiplatform support. By default, most Unity projects should use the .NET Standard profile.

Stable scripting runtime

The stable scripting runtime supports two different profiles: .NET Standard and .NET 4.x. The name of the .NET Standard profile can be a bit misleading because it is not related to the .NET and .NET Subset profile from the legacy scripting runtime. Instead, Unity’s support for the .NET Standard profile matches the profile of the same name published by the .NET Foundation. The .NET 4.x profile in Unity matches the .NET 4 series (.NET , .NET , .NET , and so on) of profiles from the .NET Framework.

Only use the .NET 4.x profile for compatibility with external libraries, or when you require functionality that is not available in .NET Standard

Cross-platform compatibility

Unity aims to support the vast majority of the APIs in the .NET Standard profile on all platforms. While not all platforms fully support the .NET Standard, libraries which aim for cross-platform compatibility should target the .NET Standard profile. The .NET 4.x profile includes a much larger API surface, including parts which may work on few or no platforms.

Managed plugins

Managed code plugins compiled outside of Unity can work with either the .NET Standard profile or the .NET 4.x profile in Unity. The following table describes configurations Unity supports:

API Compatibility Level:
.NET Standard .NET 4.x
Managed plugin compiled against:
.NET StandardSupportedSupported
.NET FrameworkLimitedSupported
.NET CoreNot SupportedNot Supported

Note:

  • Managed plugins compiled against any version of the .NET Standard work with Unity.
  • Limited support indicates that Unity supports the configuration if all APIs used from the .NET Framework are present in the .NET Standard profile. However, the .NET Framework API is a superset of the .NET Standard profile, so some APIs are not available.

Transport Layer Security (TLS)

From , Unity provides full TLS support on all platforms except WebGLA JavaScript API that renders 2D and 3D graphics in a web browser. The Unity WebGL build option allows Unity to publish content as JavaScript programs which use HTML5 technologies and the WebGL rendering API to run Unity content in a web browser. More info
See in Glossary. It does this via the UnityWebRequest API and all .NET 4.x APIs.

Certificate verification is done automatically via the platform specific certificate store if available. Where access to the certificate store is not possible, Unity uses an embedded root certificate store.

TLS support for .NET and below varies per platform and there are no guarantees on which features are supported.


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Referencing additional class library assemblies
Источник: [www.globaltradematters.org]
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