Cloud storage services allow a collaborative environment in which users can share files
between themselves. For that, users usually specify which files can be shared and which
users can access those files. Silva et al. (2014) introduced an idea that does not require a
previous statement specifying who may have access to those shared files. The protocol
of Silva et al. (2014) allows users to share data automatically by means of their similar
interests. As a result, users do not need to know any information about other users, such as
email addresses, before sharing. However, the security of stored data was not approached
in the scheme provided and in this present work it is proposed a new collaborative protocol
that successfully secure data in the cloud, while it still maintains key-features from the
previous protocol. This will be attained by the use of secure techniques, widely used in
the literature, aiming at securing user’s data.
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