Protection Against Spam using Pre-Challenges

TitleProtection Against Spam using Pre-Challenges
Publication TypeConference Paper
Year of Publication2005
AuthorsR. Roman, J. Zhou, and J. Lopez
EditorR. Sasaki, S. Qing, E. Okamoto, and H. Yoshiura
Conference Name20th IFIP International Information Security Conference (IFIP-SEC’05)
Date PublishedMay
Conference LocationChiba (Japan)
ISBN Number0-387-25658-X

Spam turns out to be an increasingly serious problem to email users. A number of anti-spam schemes have been proposed and deployed, but the problem has yet been well addressed. One of those schemes is challenge-response, in which a challenge is imposed on an email sender. However, such a scheme introduces new problems for the users, e.g., delay of service and denial of service attacks. In this paper, we introduce a pre-challenge scheme that avoids those problems. It assumes each user has a challenge that is defined by the user himself/herself and associated with his/her email address, in such a way that an email sender can simultaneously retrieve a new receiver’s email address and challenge before sending an email in the first contact. Some new mechanisms are employed to reach a good balance between security against spam and convenience to email users.

Citation KeyRoman2005d
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