Combate ao spam: um estudo de caso / Combating spam: a case study
AUTOR(ES)
Ricardo Takeshi Yamaguti
DATA DE PUBLICAÇÃO
2005
RESUMO
E-mail became an important communication tool, because it permits fast and relatively low cost information exchange. For these characteristics, it was adopted by enterprises and public institutions. In its initial project, only restrict groups used this system, and thats the reason why it demanded few security resources; In the last years, the multiplication of commercial e-mails, also known as spam, scams, and e-mails with malicious code such as viruses, worms and trojans began to affect electronic mail service users, resulting in loss of productivity and raise in the amount of technical support requests to elucidate users doubts about these e-mails. The analysis of spam in the context of who sends and who receives it is intended to aim for prevention and combat to mitigate the effects of the damages caused by this problem. For this purpose, it was decided to make a practical study to evaluate an e-mail server with an antispam system and antivirus in production environment; The costs for acquiring and renewing proprietary software licenses can be decisive to adopt a solution for filtering undesirable e-mails; Then a free software solution for e-mail filtering was chosen: Linux operational system, Qmail MTA, antispam filter SpamAssassin, and antivirus ClamAV. Rules based on keywords can be used to filter spam; However, characteristics altered in spam results in spending time to update or to create new rules. As the server administrator shouldnt be burdened by this activity, the antispam system uses the keyword rules predefined in the software and also other spam detection techniques that dont depend on the administrator to be up-to-date and functional; The e-mail server with antispam system and antivirus brings benefits to the technical support staff such as reduction in the amount of requests to deal with malicious code received by e-mail and also elucidations about e-mails forged by spammers and hackers. The technicians evaluate these items and others through a questionnaire
ASSUNTO(S)
quarentena e-mail anti-spam bayesian filter antivirus spamassassin antivírus software livre spamassassin e-mail, spam engenharias anti-spam filtro bayesiano código malicioso spam quarantine free software malicious code
