![](bg8.png)
indicators was defined as 0.7 and 0.3 respectively for
all participating providers.
Results show that it is possible to evaluate the
users reputation based on the use of computational re-
sources.
6 FINAL CONSIDERATIONS
This work proposed a reputation architecture for
cloud providers’ users reputation architecture based
on blockchain consortium model. The proposed ar-
chitecture aims to help cloud providers to prevent re-
source access to malicious users i.e., those whose rep-
utation value is low enough to be considered mali-
cious according to providers security policy defini-
tions. However, it is not restricted to this context and
it can be adapted and used by other computer sys-
tems. Users have their reputations calculated by com-
bining objective and subjective credibility indicators.
The objective credibility indicator is calculated with
the user resources utilization like memory, process-
ing, connection stability and payment. The subjec-
tive credibility indicator is calculated with the data
obtained in external data sources and the providers
feedback regarding user’s activities performed on the
provider. These two indicators make up the reputa-
tion value assigned to each user. Thus, reputation
value can be used by participating providers to as-
sist in their access control decisions. Results were
obtained through simulations performed with hypo-
thetical scenarios. In this way, participating providers
have access to user’s reputation values based on in-
teractions with themselves and with other participat-
ing providers through a shared and collaboratively
maintained reputation architecture. As future work,
tests are being developed with a greater number of
providers and users to assess architecture scalability
and performance.
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