1. Schneier, B.: Crypto-gram newsletter,
http://www.schneier.com/crypto-gram-0005.html
2. Common vulnerabilities and exposures,
http://cve.mitre.org
3. Common platform enumeration,
http://cpe.mitre.org
4. Common vulnerabilities scoring system,
http://www.first.org/cvss
5. National vulnerability database,
http://nvd.nist.gov