Systems and methods for spam detection using frequency spectra of character strings

Patent metadata

Field	Value
Publication number	US-9130778-B2
Application number	US-201213358338-A
Country	US
Kind code	B2
Filing date	Jan 25, 2012
Priority date	Jan 25, 2012
Publication date	Sep 8, 2015
Grant date	Sep 8, 2015

Abstract

Described spam detection techniques including string identification, pre-filtering, and frequency spectrum and timestamp comparison steps facilitate accurate, computationally-efficient detection of rapidly-changing spam arriving in short-lasting waves. In some embodiments, a computer system extracts a target character string from an electronic communication such as a blog comment, transmits it to an anti-spam server, and receives an indicator of whether the respective electronic communication is spam or non-spam from the anti-spam server. The anti-spam server determines whether the electronic communication is spam or non-spam according to features of the frequency spectrum of the target string. Some embodiments also perform an unsupervised clustering of incoming target strings into clusters, wherein all members of a cluster have similar spectra.

First claim

What is claimed is:

1. A method comprising:
employing at least one processor of a computer system to receive a target string forming a part of an electronic communication;
employing the at least one processor to process the target string into a target signal consisting of a sequence of numbers, wherein each character of the target string is mapped to a number of the sequence of numbers;
in response to receiving the target string, employing the at least one processor to determi…

Assignees

• Dichiu Daniel
• Lupsescu Lucian Z
• Bitdefender Ipr Man Ltd

Inventors

• Dichiu Daniel
• Lupsescu Lucian Z

Classifications

• G06F16/93

  Physics · mapped topic

• H04L51/00

  Electricity · mapped topic

• H04L12/585 Primary

  Electricity · mapped topic

• H04L51/212 Primary

  Electricity · mapped topic

• H04W4/16

  Electricity · mapped topic