Solution
1. Vendors
2. CERT organizations
3. Public network sources
4. Membership sites
Vendors
provides either direct support of indirect tools that allow user communities to support each other; intel on emerging threats
CERT organizations
provide notification services for free
Public network sources
mailing lists and Websites available to orgs and people
Membership sites
various groups and orgs; add contextual detail to publicly reported events and offering filtering capabilities
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Vendors is the most effective
The reason is that it provides direct support and intel on emerging threats
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All the best
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