Description: A popular method of product validation is using keys similar to VJJJBX-H2BBCC-68CF7F-2BXD4R-3XP7FB-JDVQBC. These compact keys can be derived using Symmetric Key Cryptosystems such as the Advanced Encryption Standard (AES).
Other Public Key Cryptosystems are available such as RSA. However, these systems generally produce larger keys (which the user will eventually have to enter into the program to unlock functionality). Smaller producing Cryptosystems exist, but it is the author s opinion that they are highly encumbered with patents. Quartz is one such example. It is a Public Key Encryption System that produces a smaller cipher text based on Hidden Field Equations (HFEs). The Quartz website is littered with phrases such as "must license" and "pay royalties".
The reader is also encouraged to investigate Signature Schemes (with Recovery) as an alternative method to producing Product Keys. An example is PSS-R, a Message Recovery Signature Scheme based on RSA. PSS-R is not suitable fo
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AESProductKey.aspx.htm
AESProductKey.aspx_files
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