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Secured Flipped Scan-Chain Model for Crypto-Architecture

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3 Author(s)
Gaurav Sengar ; Indian Inst. of Technol., Kharagpur ; Debdeep Mukhopadhyay ; Dipanwita Roy Chowdhury

Scan chains are exploited to develop attacks on cryptographic hardware and steal intellectual properties from the chip. This paper proposes a secured strategy to test designs by inserting a certain number of inverters between randomly selected scan cells. The security of the scheme has been analyzed. Two detailed case studies of RC4 stream cipher and AES block cipher have been presented to show that the proposed strategy prevents existing scan-based attacks in the literature. The elegance of the scheme lies in its less hardware overhead.

Published in:

IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems  (Volume:26 ,  Issue: 11 )