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Chapter 7 – Implementing Secure Licensing Contents Glossary Index Troubleshooting Implement Query-Response Protection 172 Sentinel Hardware Keys Developer’s Guide The AES algorithm-based query/response protection is the primary method of securing an application. Simply storing data in the key memory is relatively easier to mimic because once the hacker knows what the memory should contain, they can modify the application to return those values instead of actually reading them from the Sentinel Key. Query-response protection is a challenge-response like technique driven by the AES algorithm programmed in the Sentinel Key. The application sends a query to the Sentinel Key, which sends a response calculated using the AES algorithm, for evaluation. If the response obtained matches the expected response, the key is assumed to be present and application is allowed to run. Using the SFNTQueryFeature API on an AES feature programmed into the Sentinel Key allows your application to issue a nearly infinite amount of unique challenges. This mechanism becomes the backbone of your protection strategy since it is extremely difficult to duplicate the correct responses. You can implement this protection by adding an AES feature to your template and then using the SFNTQueryFeature API to challenge the algorithm stored in the license. However, just using the API once in your application is not enough; there are many other tips, like given below, you should endeavor to employ.
Query-Response Protection Create a Large Query/Response Table Tips and Tricks Contents Glossary Index Troubleshooting If your application only knows a few challenges to issue to the Sentinel Key, then it becomes easier to predict them. However, a large table will take a long time to use every possibility; thereby increasing the time taken to emulate every possible challenge. Split Large Table You must split the large table into several smaller tables. This places the tables at multiple locations inside your protected application and makes it difficult to find them all. Sentinel Hardware Keys Developer’s Guide 173
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Copyright © 2009, SafeNet, Inc. Al
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Certifications European Community D
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FCC Compliance FC Sentinel Hardware
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Contents Sentinel Keys Server .....
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Contents Sending Group Files to Dis
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Contents xii Sentinel Hardware Keys
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Conventions Used in This Guide You
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Technical Support Technical Support
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We Welcome Your Comments Export Con
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Chapter 1 Introduction In this chap
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Sentinel Keys Protect Against Softw
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Sentinel Keys Offer Sophisticated P
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Sentinel Keys Offer Sophisticated P
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The Business Layer API Functions Se
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Programming Utility Sentinel Keys T
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Frequently Asked Questions Contents
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Chapter 2 Sentinel Hardware Keys SD
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Compiler Interfaces Sentinel Keys L
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Distributor Key Distributor Key Con
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Sentinel Keys Contents Glossary Ind
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Sentinel Keys Server Contents Gloss
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Sentinel System Driver Sentinel Sys
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Backward-compatibility Information
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Command-Line CodeCover Utility Cont
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Key Programming APIs Contents Gloss
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GCC a For Linux Compiler/Environmen
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Sentinel Keys License Monitor Conte
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Secure Update API Frequently Asked
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authentication.) Frequently Asked Q
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Chapter 3 Planning Application Prot
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About Features, Templates, and Grou
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Planning Application Protection and
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Enabling License Sharing Planning A
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Part 2 Designing and Implementing P
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Chapter 4 - Protecting Applications
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Appendix A - Troubleshooting Conten
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Appendix B - Glossary Contents Glos
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Appendix C - Sentinel Keys Hardware
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Appendix D - Migration from SuperPr
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Appendix D - Migration from SuperPr
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Index Contents Glossary Index Troub
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