30 May '12, 3pm

Proof That Military Chips From China Are Infected?

Scanning the JTAG command field for any unknown commands by checking the length of the associated DR register revealed an interesting picture. There were plenty of commands for which the associated DR register has a length different from one, hence, used by the JTAG engine. Figure 4a shows some of these registers with the light ones being known from STAPL file analysis, and the dark ones showing newly discovered registers. Not only that, but some registers were impossible to update with a new data suggesting that these registers wererepresenting a ROM (Read-Only Memory) (Figure 4b). This did make some senseas we learned about FROW memory from the STAPL file, from which only onerow was actually read, but three address bits allowed eight rows to be accessed. All those hidden and non-updatable registers were found to be imprinted into certain locations in FROW memory. However...

Full article: http://defensetech.org/2012/05/30/smoking-gun-proof-that-...

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