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Scan attacks exploit facilities offered by scan chains to retrieve embedded secret data, in particular secret keys used in crypto-processors for encoding information in such a way that only knowledge of the secret key allows to access it. This paper presents a scan attack countermeasure based on the encryption of the scan chain content. The goal is to counteract the security threats and, at the same time, to preserve test efficiency, diagnosis and debugging abilities. We propose to use thedoi:10.1109/ets.2017.7968248 dblp:conf/ets/SilvaFNRPR17 fatcat:xfs6kokdh5fd3bff5nungsfak4