Realization of SR-Equivalents Using Generalized Shift Registers for Secure Scan Design

Hideo FUJIWARA  Katsuya FUJIWARA  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E99-D   No.8   pp.2182-2185
Publication Date: 2016/08/01
Online ISSN: 1745-1361
Type of Manuscript: LETTER
Category: Dependable Computing
Keyword: 
design-for-testability,  scan design,  generalized feedback/feed-forward shift registers,  security,  scan-based side-channel attack,  

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Summary: 
We reported a secure scan design approach using shift register equivalents (SR-equivalents, for short) that are functionally equivalent but not structurally equivalent to shift registers [10 and also introduced generalized shift registers (GSRs, for short) to apply them to secure scan design [11]-[13]. In this paper, we combine both concepts of SR-equivalents and GSRs and consider the synthesis problem of SR-equivalent GSRs, i.e., how to modify a given GSR to an SR-equivalent GSR. We also consider the enumeration problem of SR-equivalent GFSRs, i.e., the cardinality of the class of SR-equivalent GSRs to clarify the security level of the secure scan architecture.