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MLars19's avatar
MLars19
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1 month ago

Cyclon 5 tampering protection bit

I have a cyclone V with an AS scheme. I have generated an key-file (ekp) with tampering protection bit set according to AN556 Then I open it in the programmer programmer and generate a jam-file no...
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MLars19's avatar
MLars19
Icon for New Contributor rankNew Contributor
1 month ago

If one for example missed the `-eDO_KEY_SECURE` flag and just programmed the key.

Is it possible to just program the tampering bit afterwards?

Farabi_Altera's avatar
Farabi_Altera
Icon for Regular Contributor rankRegular Contributor
1 month ago

Yes, you can program the tamper protection bit separately after the key has already been programmed. The `-eDO_KEY_SECURE` switch is what triggers tamper-bit programming during a `.jam` file execution, so if you omitted it the first time, you can re-run the programming command with that switch added.


When programming the design security key with a `.jam` file that has been converted from an Encryption Key Programming file (`.ekp`) that contains the tamper-protection bit programming instruction, add the switch `-eDO_KEY_SECURE` to your programming command if programming of the tamper-protection bit is desired. How do I enable programming of the tamper-protection bit when programming with a .jam file which has been converted from an an .ekp file that contains the tamper-protection bit programming instruction?


So the resolution is straightforward: add the switch `-eDO_KEY_SECURE` to your programming command if programming of the tamper-protection bit is desired.