| Summary: | 碩士 === 國立臺灣科技大學 === 資訊工程系 === 96 === The e-mail service is indispensable to our daily lives.
Modern e-mail systems are based on the client-sever design,
where attackers may distribute spam e-mails and most anti-spam mechanisms rely on the content-filter-based approach.
The email directory harvest attack (DHA) is a special form of brute force attack.
The attacker attempts to gain information about email addresses used in a domain name.
Peer-to-peer architectures share computer resources by direct exchange,
rather than requiring a centralized server.
Applications on peer-to-peer networks are scalable, fault-resilient, and reliable.
In this thesis we present a defence mechanism,
where the content filtering is optional,
against DHA in a messaging system based on the peer-to-peer network.
Simulations show that our approach successfully blocks spam messages from spreading and identifies spammers.
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