System and methods for detecting malicious email transmission
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United States of America Patent
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Feb 2, 2010
Issued Date -
N/A
app pub date -
Aug 16, 2002
filing date -
Aug 16, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A system and methods of detecting an occurrence of a violation of an email security policy of a computer system. A model relating to the transmission of prior emails through the computer system is defined which is derived from statistics relating to the prior emails. For selected emails to be analyzed, statistics concerning the selected email are gathered. Such statistics may refer to the behavior or other features of the selected emails, attachments to emails, or email accounts. The determination of whether a violation of an email security policy has occurred is performed by applying the model of prior email transmission to the statistics relating to the selected email. The model may be statistical or probabilistic. A model of prior email transmission may include grouping email recipients into cliques. A determination of a violation of a security policy may occur if email recipients for a particular email are in more than one clique.
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