There’s a great online tool to detect malicious IP addresses AlienVault’s Global OTX Dashboard http://www.alienvault.com/open-threat-exchange/dashboard#/threats/top One use springs to mind is to get a feed & use this a realtime block list.
List of Blogs http://www.securitybloggersnetwork.com/ http://ddosattackprotection.org/blog/cyber-security-blogs/ Some good ones http://nakedsecurity.sophos.com/ http://www.pauldotcom.com/ http://www.sophos.com/en-us/company/podcasts.aspx https://isc.sans.edu/index_cached.html http://threatpost.com/ http://taosecurity.blogspot.com.au/ http://www.darkreading.com/ http://www.securitybloggersnetwork.com/security-bloggers-network-the-feed/
Two of my favourite security bloggers are Bruce Schneier at https://www.schneier.com/ Mr Schneieris a highly experienced cryptographer and security analyst. He’s passionate about security and exposes both the flaws of Govt systems and the abuse of power by the NSA in weakening internet security. Brian Krebs http://krebsonsecurity.com/ Is a security researcher. He’s an old fashion investigative journalist, who has turned his skills into investigating online security and breaches. Feel free to suggest to others.