The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 07, 2010
Filed:
Feb. 21, 2008
Jaesik Choi, Savoy, IL (US);
Jay Pujara, Palo Alto, CA (US);
Vishwanth Tumkur Ramarao, Sunnyvale, CA (US);
KE Wei, Palo Alto, CA (US);
Jaesik Choi, Savoy, IL (US);
Jay Pujara, Palo Alto, CA (US);
Vishwanth Tumkur Ramarao, Sunnyvale, CA (US);
Ke Wei, Palo Alto, CA (US);
Yahoo! Inc., Sunnyvale, CA (US);
Abstract
Detecting and blocking spam messages using statistical analysis on distributions of message sizes for a given IP address. Mail volumes are examined to model a distribution of volumes to cluster IP addresses. The messages sizes may distributed across ranges of message sizes, which is then used to determine an entropy of message sizes for the given IP address. The entropy of the given IP address may be compared to entropies of known good IP addresses, and if a difference between the entropies is statistically significant, then the given IP address may be determined to be an IP spammer. User feedback may also be employed to further characterize an IP address. For example, a number of messages from the IP address may be sent to intended recipients. User feedback may then be monitored to determine whether to the IP address should be reclassified.