Abstract
In the last fifteen years, the Brazilian government's organs have been running into the following problem: using the systematic of Digital Signature, what should be done with the Access Control Systems already implemented which have proved successful so far? Should they be replaced? Does the Digital Signature, used alone, guarantee the authenticity of transactions between those involved? This paper wants to answer these questions and was written based on an exploratory research that used the method of case study, with access to primary data projects and systems. Were described two successful experiences of each system: the Access Control of the Sao Paulo's Department of Finance (SEFAZ-SP) and the Digital Signature of the Federal Revenue in Brazil (SRB). It was possible to verify that an authentication system for digital signature do not have the primary purpose of replacing directly the access control systems, but the two systems can operate in an integrated and complementary form.
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