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SPKI/SDSI is a framework for expressing naming and authorization issues that arise in a distributedcomputing environment. In this paper, we establish a connection between SPKI/SDSI and a formalism known as pushdown systems (PDSs). We show that the SPKI/SDSI-to-PDS connection provides a framework for formalizing a variety of certificate-analysis problems. Moreover, the connection has computational significance: many analysis problems can be solved efficiently (i.e., in time polynomial in thedoi:10.3233/jcs-2004-123-402 fatcat:b54idxcny5cfpdt4atrvsjkgpi