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9 cze 2010 · For online validation, the license server holds the secrets for decrypting the information. For offline validation, the decryption secret (s) are included with the software itself along with the decryption/validation code. Obviously, offline validation means the software isn't secure against someone making a keygen.
But coupled with a modern licensing server, cryptographic keys can be used to implement more complex licensing models, such as these popular ones: An entitlement-based model that gates access to certain features or versions of an application by a license's entitlements.
7 mar 2011 · If there is no real need for security, then here is a very fast serial number generator, with a checker: User a counter. Initialize it at 0. When you want a new serial number, increment your counter by 1000; the new counter value is the serial number.
Choosing a cryptographic scheme will instruct our systems to encrypt or sign all license keys which implement the Policy. Many of these solutions can be packed into an easy-to-use and easy-to-distribute license file or certificate, and delivered via email, USB key or other means.
20 paź 2023 · What comes to mind is: I use a RSA public key on client side to decrypt A. I use a RSA private key on server side to encrypt A. The attacker should not know either of these two. But if he is able to extract the public key on client side, breach (1) happens, but he is at least not able to reach breach (2).
It is simple and cryptographically secure. Scope. When you browse StackOverflow for licensing implementations, you frequently read the following warning: No license scheme is 100% secure. It is true. So, given that our task is ultimately impossible, we don't want to think about it for too long.
Cryptographically validating encrypted and signed licenses can be used to implement offline licensing, as well as adding additional security to your licensing model. All that is needed to cryptographically validate a license is your account's public key. The license's policy must implement one of the following schemes: ED25519_SIGN.
